That's 1 mean looking dretch

IMO the head and the front legs are
a little too big compared to body and other legs. Could fix it by moving the head and the 'attachment point' of front legs forward, and then stretch the body forward (front legs are fine if bigger then others, just not that much).
Maybe also make the back of the body less flat?
About the lower jaw: in general it's a bit too thick, and if you follow the quads surrounding the mouth, they go from the front/side of lower jaw to the 'lip' of the top jaw. It makes the lower jaw look a bit twisted/squished.
The teeth should be bigger, and more of them. On mara/goon/rant, the teeth are right next to each other, where 1 tooth ends, the next one starts.
That is really everything I could think of
