Thank you for pointing that out! Oftentimes when I finish a picture and/or upload it, I'm in that post-production mentality where I overlook whatever needs fixing; generally I need to come back the next day (maybe a few days) or find a fresh perspective through comments like these.
You'd think after a time I would learn to curb my enthusiasm and just wait before the initial upload, but I've learned two things: (1) something will always get pointed out after that upload no matter the breaks taken to fix things with a fresh eye; (2) I crave immediate validation on work.
I really like the composition and execution here!
I think you tried to go for some depth, but the one thing that bothers me is that the black stripe looks thicker on the left of the button. On a sphecical object any vanishing point is as far away as any other side, so the thickness should be even. If anything it's thicker in the middle as that part sticks out. I also think it's supposed to be recessed if memory serves.
I can certainly relate, I'm exactly the same! Hopeless case!
Edit: Oh you fixed it! Perfect!