Your retopo in general is very clean and evenly gridded. In that way, great job! It’s clear that you have been diligent in those principles.
If you were to animate this head, the density of the retopo is a little on the high side which could threaten the ability for the mesh to be animated and played back in real time. Also the mouth especially doesn’t have concentric edge loops surrounding the mouth which is very important for reliable mouth deformation.
If you’re not aiming to animate this character (or you’re not trying to make it animation friendly) those notes don’t really apply. I’m looking forward to seeing you finish Boogerman’s whole body 💪
