i like the character, its shaped pretty well especially the arms. you might want to reconsider your edge loops, though. right now, they don't seem to flow very well. you want to try and have your edges flow like the muscles of the body, keeping deformation in mind when it will be animated.
Short answer: Triangle Striping. Longer-ish answer: Invisible edges can flow any which way when models are exported/imported. It's up to the ex/importer and the application to define how they flow. If you triangulate, it doesn't give them the option to flip. Slightly more detail:…
You can always learn something about how to properly build a lowpoly. And with 'edge flow' I mean every triangle edge. Just last year I had some fun time going through the edge flow of breath-of-the-wild-links fingers. There are just so many ways you can do it wrong with a plain "nude" figure. Not to mention more complex…
I think it's a good start, id change the flow on the sides of the nose, make them flow into the eyesocket. Usually i prefer to run the nose edges all the way around the skull instead of ending them between the eyes. Also dont leave your edges flat on the nose, bring the outer ones down a bit.