The eyes I actually rather like. But the way the facial features look sculpted/painted on top of what looks more like a faceplate (because it's raised above the visor) looks like he's, well, wearing a mask of the bottom half of his face. It's a shame because the helmet and spines and ears look great otherwise, and it all turns odd once you hit the bottom half.
Really should've found a way to paint, idk, a burning speed effect on the front of that car hood or something so he has the red shoes.
Then again, technically this is apparently a "new character"? But they go so hard with the rest of him to evoke Sonic specifically that whatever doesn't land is a more noticeable miss. Otherwise the altmode looks pretty cool. Same for the Wingtail/Tails biplane, although that feels a bit gangly for something that evokes Tails.
(Aside: as a kid I first learned of the character as "Tails", then a while later found out it was "Miles 'Tails' Prower". I was so thrown by him being given a full name that I just ignored it. As such, never having read it or said it without "Tails" in the middle, I never actually realized the "miles per hour" pun until I was an old man.)