What kind of animal is he based on? For the front &underside view it would pay to take some creative liberties and use real pictures & skeletal structure for replacement ref, I think. No need to match them 1-1 of course but it might help you figure out what looks off.
Edit: As for my opinion, I think that his snout/muzzle needs to be longer and lower, as well as his chin/jawbone being more forward. Your current version looks like a... actually, like a chibi version a bit No judgement if you're going for a bit cleaner and cuter, but thought I'd mention it.
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Edit: As for my opinion, I think that his snout/muzzle needs to be longer and lower, as well as his chin/jawbone being more forward. Your current version looks like a... actually, like a chibi version a bit No judgement if you're going for a bit cleaner and cuter, but thought I'd mention it.