Printing File and Mockup

[AshrafZaini]

Hi, I'm new and curious

I'm curious on how some of you guys would work on this. For example in the screenshot attached, how am I suppose to maintain the artwork similarity between the printing file and the mockup. Also what's the best way to grading the printing files in between all sizes?

[jdanek]

What do you mean by "grading"?  Is the "Blue" the shirt color?  Your print file will not be the same as the mock-up.  In a mock-up, you have to build in highlights and shadows, which often require gradients.  And, it also depends on the shirt printing process.  Your design sample would probably be printed using a fabric printer direct onto the fabric, then trimmed out, then sewn.  Not sure why you would question the differences between a mock-up and a print file.  Totally different.  Please expand a little on your objectives.