Let me give you some advice since I customized a brawl stick for a friend for Christmas.
was just testing the waters with this, but I think im gonna polish and go for it
wish my case was white inside of black
also im worried about the artwork having noticeable artifacts
End result:
Here's my takeaway from that experience.
Kinkos lamilabel RULES. Printing cost me like $4. FOUR DOLLARS.
Pro-tip: don't leave the button holes blank. If the print is even a little bit off, it'll show white. Just use the BG color and then if it shows its NBD. Look closely around the buttons in the pic above and you'll see what I mean.
For design critique, there's too much unused space. The yellow in the art I made is just noise, patterns, but it makes the picture look a lot more complete.