This is a short example of how I upscale images for laser engraving. This is a 1200px x 960px image upscaled to 4800px x 3840px. The laser engraving is done on an 8 x 10 canvas. The canvas was painted with a coat of white followed by 2 coats of orange and a final 2 coats of black.

upscale website - https://waifuxl.com/
imagR website - https://www.imag-r.com/

These are affiliate links. You get a discount and I will get a commission whoopi!
Comgrow: https://comgrow.com?sca_ref=3863049.hf1agsrXk6
Atomstack: https://www.atomstack.com/?ref=e2vymlwe
Wizmaker: https://www.wizmaker.com/?ref=kyjxzkza