I also used Nano Banana from this link. You get a certain number of free downloads per day, and without a watermark.
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It’s not finished yet, but it’s already much better. I combined Standard Max, Wonder v1, Recover V2 medium for certain areas of the bird, and Recover V2 high for the background to smooth out the grainy look of the original.
I don’t want to bore you again with my birds, but as I was going through my dusty photo storage, I came across an interesting image. It’s a crop from a photo of two very young brothers fighting over sunflower seeds. I think they’re Greenfinch birds. Their parents are very yellow-green. The family has been living nearby for several years and they’re doing well. They’re quite aggressive towards other songbirds (in the fight for food) and will only run away from a squirrel or a woodpecker when they come to steal the seeds.
I couldn’t find anything better than the result from Gigapixel redefine-creative low texture 3-upscale 4x (with prompt); I haven’t tried Gemini or anything like that. There’s some improvement there. I just don’t know what to do with the background, it looks strange but it’s reality (the white spots are from the seed husks). Well, in the end they both ate their fill.
Original:
Result:
I like the greens in these pics. They aren’t neon.
I tried fine-tuning it initially with Hypir AI. You won’t be disappointed.
Yes, I would say that the colors here are generally good and realistic. Sometimes it’s worse when printing. I only have a regular inkjet printer (cheap) and I don’t even know if it could be calibrated with my external monitor (it’s not completely bad, but certainly not top-notch). But I only print something exceptionally. The same colors differ between different monitors, so that’s a matter for professionals. For me, there’s no point in spending a lot of money on perfection. And I lost the calibration instructions. 
Thanks for the tip, I’ll try it.
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@unrelent Here is my improved version of your photo with cropping.
And the link to the high-definition version.
I used hypir to refine the details as well in order to remove the rough look of the photo and I finished with Gigapixel redefine only on the details of the feathers.
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I would say here that the grass is distracting, and doesn’t match the sharpness of the bird. If the bird is that sharp, the grass could be a lot softer as if photographed with a long lens. The grass could be even more blurry, and making it darker is a personal choice but here is where I would go with this: (It’s a screenshot, so quality is not 100%)
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I like the darker grass. It makes the bird stand out better, I think. But definitely the grass “behind the bird” should be completely blurred. The truth is that a long focal length was used for the photo (the small bird was relatively far away, at least 10 meters). So, maybe, similarly, something like this:
This one looks more natural 
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You don’t bore me. They are young Greenfinches. Your picture looks fine and natural. If you try to wring more detail out of it, it will end up looking artificial and processed.
I’ve added a second picture to my original post to address the sharpness of the grass. The text explains the difference in one process that I used to change it from my original picture.
It also gives a brief description to explain why grass looks greener in the Spring. Which is when the picture was taken and on a bright sunny day.
Regards Robert.
Here is the promised Nuthatch. This is the one that brilliantly climbs down the tree head first (I don’t know if any other bird climbs like that). Here the bird is sitting on a feeder with sunflower seeds. He is already used to me and ignores me, we have known each other for many years. There are 2 or maybe 3 families of Nuthatches. It has a large consumption of seeds during the summer, because it stores them for the winter. He’s a brave bird – I once watched a mouse climb into the feeder (to steal seeds) and the bird eventually chased it out with its beak. So as usual:
Original:
Result:
p.s. Gemini didn’t quite keep the original bird, there are some minor changes. The improvement probably outweighs it (but the AI should improve).
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The Nuthatch looks good though I’m not keen that it hasn’t kept the original bird (Is Gemini putting its own picture of a Nuthatch in there?) and I’m sorry to say that I’ve counted at least 20 other birds scattered through out the picture. If you zoom in 200% you can spot them. Sorry.
Regards Robert.
Oh yeah, you’re right, I see it now too. Nasty artifacts. Failed “improvement”, I’ll have to try something else.
I like the more natural colors you’ve brought to the photo. I could have done that too; I just forgot to pay attention to that detail. I was mainly focused on sharpening and cleaning up the image.
The best approach is to combine several variations of the same photo taken with different models. That’s what I do in my workflow. Yes, it takes longer, but it guarantees a much better quality final photo without ugly artifacts everywhere.
Okay, I used your colorimetry as a guide to correct my version.
Now the look is softer and I also blurred the background a bit with Adobe Camera Raw.
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@unrelent Here is the final, revised version.
With a good prompt and a few passes in Google Gemini and a final pass in Nano Banana in 4K, very good results can be obtained without distortion and with the same bird in the same posture.
I took the opportunity to redo the background blur, which was simply awful.
By the way, here’s the final prompt I used for the 4K version:
“Increases the photo resolution. Increases sharpness and detail. The wooden bird feeder should be very detailed. The bird (nuthatch) should be very detailed. Example with all the micro-details of the feathers. Maintains the exact same posture of the bird (nuthatch). The grass should also be very detailed.”
