First of all I'm Alcala or David for a better pronusiation, I'm not very new to pixel art, in fack I'm working in learning in geometrical desing in pixel art.
And second of all here's my work.

The right one is the original I made, and the left one is another copy of the original but with colors, I need some help with the eyes, the glasses and the hat.

This one is a little thing I'm making for a little practice with my shading, and so far I'm not very good at it, I'm still missing the buttons and I'm not very comfortablewith how it looks like.

Any ideas and opinions ?