I drew my RAPOO M10 Optical Wireless Mouse and added some values.
After a few days: I fixed some things, but it still needs more work.
Then a few weeks later, I figured I should have laid guidelines first before drawing. This helped because I felt my perspective was less 'jumbled' than the RAPOO mouse.
I had added more shadow, but my tablet crashed.
6/01/17:
Someday, when I'm not lazy, I'll fix the perspective on the main.