I love It but here's my small nitpicks:
I believe the Griffon's left eye should have been more closed since the eyelid's instinct is to protect It from the bloodloss even after death so It would decend more than this (but I understand you wanted maybe to show It with the blood inside), I was also wondering if there was a frown or not on the forehead so here I go anyway, these muscles should have relaxed more unless the death was claimed by a quick and painful blow, but this is otherwise great, my little plus here got to be the style you went with for the background, just enough details to catch my eyes without taking all my attention keep It up!