Well mate, its not a bad piece at all. Raptors are not awlays easy. we all have an idea of what a raptor is (in our head) and that dosnt always match what is real. Yours aint bad at all. if you want some comments i would say:
one of the reasons for the slightly 'cartoon' stle of teh head is the forehead/eye-line (as already mentioned) but also teh solid block of yellow dosnt help, the beak is a tad heavy and too wide (as you probably know) plus missing the 'nostril ridge'. It works on this piece thougha s it fits the overall character. eyes on a raptor are bigger though, check out raptor skuls, the eye sockets are huge
feet are good, proportions about right but the legs maybe a little high at the hips (have a look at a few skeleton-pictures to see what i mean). when a raptor raises his feet that way it has to arch its back more, which would bring the tail downwards... which is what they do when striking to an extent anyway. i like them but open them next time, raptors 'strike' with the hind talon usually so the toes are opened. good proportions though and excellent detail of the undersides, the ridges and folds
wings.. hell, we have to workw ith the available wood but you got the bend in the right place (many dont). next tie try thinning them, in general they are much thinner after the 'bend' (which is .. i guess.. the wrist if you want to think in terms of human arams), from then on downwards its effectively just feathers so needs to be thinner. great work on the feather arrangements and going for a more 'blocked out' than just lines drawn on. next time stagger the blocks, its more work but worth it. also, when you make the cuts hold your saw on an angle so you are cutting with the corner of the tooth, not the flat of the tooth, that way you can undercut each feather (or block of feathers). it lifts them out a bit. check out the work of scott Dow (american carver), he masters the whole pop-out feathers thing. I try to emulate him but i stil have a long way to go.
hope some of that helps? if you facebook, drop me a line and ill try show you what i mean.
not surprised it sold, it has personality and often thats worth more than detail