Start with the highest-resolution original image available
Use a high-quality image upscaler or AI super-resolution tool
Increase resolution gradually, not in one extreme jump
Sharpen the image lightly after upscaling
Reduce noise before or during enhancement
Adjust contrast and clarity carefully
Save in a lossless or high-quality format like PNG or TIFF
Avoid repeated compression and re-saving as JPEG
Crop only after upscaling if possible
Use professional editing software for best results
Export at the target size and resolution needed
Check the image on a large screen for quality issues