Hey man. Love the colour scheme you've got going on this guy. Just a few issues with his general proportions, for example, his hands are a bit on the small side. I think you would benefit a lot from using some reference images to draw people as practice. The shading's alright, but you don't have to limit the shadows to only follow the edges of each outline (I did the same thing for a really long time), you can give more depth to the image by playing around with the shadows a bit. Nor do the shadows have to always be simply darker, you can play around with the saturation or even slightly different colours for some interesting effects in the shadows. I'm just being really nitpicky though because to already be producing art like this is very promising :) Good luck man looking forward to your next piece!!