Great work on the head and the face in particular. You did really well about the rim of the frill
As for hopefully constructive criticism I think the drawing could be improved further if you add some lines to the legs of the dinosaur (the hindleg doesn't really stand out from the body). Another minor improvement might possibly be achieved if you place the bottom of the horn (where it makes contact with the face) a bit lower rather than directly on the outlines.
Oh yes. The legs aren't quite right and I knew that. But I guess they would do for a quick drawing to show if I can or cannot draw this way

I agree with you on the horns though.

Here's the head... Took more care of it now.
