Love the majestic feel!!! the detail on the body is stunning!! keep up the great work

A very creative design.
Love the simplicity of the face, very adorable. The horns could have been integrated more towards an oceanic feel, maybe if they were corals or something of that nature.
The body must have been hard to design since both Pokemon you used had such different body types.
nice touch on the 3 tails

if it isn't to much trouble I'd like you to critique my entry:
http://www.newgrounds.com/art/view/tunafishat9/venuking-venusaur-seaking-combanation

the shading applied to the Beedactyl is insanely good, love the simplistic nature of the illustration. The abstract background really draws focus onto the Beedactyl itself which makes him oh so much more terrifying and fierce. Also love the blending of the two creatures anatomy, very natural.

All that being said, there should be no reason for you to feel any form of anxiety because your artwork is insanely awesome!!!! keep up the good work and maybe give my submission a look and maybe give it some critique as well:
http://www.newgrounds.com/art/view/tunafishat9/venuking-venusaur-seaking-combanation