Show Off My first GFX attempts

[AngelsShadow]

So I decided to start making these recently, I find it a lot of fun! Does anyone have any advice Or some helpful tips it would be awsome! I use chrome sketchbook 3.5. For my GFX, oh an what are the sizes to make avatars? Any advice, compliments ,or even some constructive critisimwould be much apreciated

Spoiler: my works

the first two were my first ones they are in the order i have made them

 

[AngelsShadow]

I can make a custom one for someone who wants one