It's a very interesting character, and if it's your first, all the better. Do you have any references for this character? Are you going for cartoony, realistic, or? :)
Here's what I came up with regarding my understanding of "good character models". Some of it can be explained away by the fact that animation makes a character as well, but the model needs to be able to support that animation in the first place, so... Doom 2016: has life and power <3 It's not just about the ability to tear…
Super character! The bottom back of the knee and boot front look sucked on in the textured version. Maybe you could ease off on the AO (and contrast in texturing) in those areas. Had a look on the web for 'bowl cut' hair styles and the one you used is realistic, but longer hair on top looks more natural to me. Great work.