>>2638650Get decent at photoshop or clip studio paint (or whatever other preferred program). A program that lets you work on layers is the bare minimum and a godsend.
Learn to match styles. Use the same line thickness for example. Try to match their lines, whether they have a smooth lines that thin/taper or sketchy lines that show that they go back and forth with multiple passes.
Use the cloning tool in the programs. It might seem weird at first but it can act as sort of an "in-style eraser"
The smaller the edits, the less noticeable it will be. The closer the edits are to the focal of the picture, the easier they will be to notice.
Be honest and critical of your own work. Looking back on things after doing other edits can help you notice things you wish were different then, but also makes your skill improvement over time feel more tangible.
#1 way to improve is to just do it and just practice (obviously). Trying to photoshop or edit anything actual builds the same skills. I personally got most of my photoshop practice fooling around with GUI related stuff back in high school, but my ability to edit passably came from having to clean/redraw my own shit to translate/typeset. Find the practice that resonates with you.
If caffeine gives you jitters, try waiting a little to let them calm down before copying styles. Relatedly, it can sometimes help you copy artists that have a jittery style. If you zoom in A LOT, it can help make smoother lines sometimes.
Bonus points: Having people honestly critique your work can be the FASTEST way, but also the most vulnerable way to improve. You will be able to improve just fine without critique, and some people would otherwise quit with feedback. Feedback can hurt, even if given nicely. So that's really on you. Learning speed VS protecting your own feelings and possibly preserving motivation.