Check Out My Kain Portrait

i would suggest referencing kains iv ports for the chin. top tip with regards to shading if ur unsure place a very light color in the top left and think of this as your light source, here is a basic example for you (it is very basic done in a few minutes) but i think it illustrates what im saying a bit better:

the top 2 are copies of some of the shading i see here and the bottom is with a light source
dont get me wrong i know they suck and i would usually use more colors better shading ect but
i think it helps give u an idea of what im talking about. as for the drawing itself yeah its pretty good don't give up i can see u becoming pretty good at this, hope this helps somewhat