can i give you one good tip? it worked for me, i reached this conclusion based only on experience. its the story of my modelling life hahaha so... i started as a char artist. my first char was this one: (yes, i still keep my oldest work. it might be like 4 or 5 years old by now xD). at the time i had no idea of what…
it seems that you have gotten the overall proportions right. the head is still way too blocky, it needs some additional horizontal edgeloops. not much 2-3 should suffice. this is just so you can smooth it out to get a rounder shape for the head. from here you could try to subdivide the mesh and start blocking out muscle…