Knuckles has only a vague case of 'saucer head', which is a plus. His expression is nice, but the eyes are a bit big, and if you own him, it shows better.
Knuckles Break Alert!
The arm dropped out of the package separate from this figure when it was opened. It pops back in but...

It should be noted that his head won't turn at all. His arms have limited mobility due to the hanging quills, but that's standard Knuckles territory. The tail of this figure is quite long, but it's also flat, with a distinct kink in it.