its pretty far back on this ref too - #648157 - artist:ashidaru, commission, oc, oc:hatii, original species, safe, shark, shark pony, sharp teeth, simple background, solo, transparent background, vector - Derpibooru - My Little Pony: Friendship is Magic ImageboardPretty good! I like it overall.
Not complaining, but the one thing I can think of that looks a bit off is the chin. But looking back at the sample image I provided, I see the chin looks about that way too.
The other thing is maybe the dorsal fin is a bit far down the back?
Like I said though, not complaining! Thanks for even taking the time to draw it.