Is it best to upscale in Topaz Photo AI before or after I make a composite of images

Hi,
I am about to make a large composite of Midjourney Images to produce a work of approx 4x3feet. Am I best to upscale each image beforehand or wait until I have finished the composite and upscale the image then?
Thanks in advance.

It would be recommended to upscale each image individually and then use those images to create your composite image.

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