Not bad for your first try. :)

This looks nice!

Pointers:
-When drawing the snout, try and make it like an alligator or crocodile. It's long, rectangle, and has small mounds near the end for nostrils.
-for details, work on the scales.
-for coloring, most dragons have dark colors on their scales, but the color often softens are becomes softer when near vulnerable parts of the body/ fleshy parts like the stomach.
-as for wings, try looking at bat wings. They are webbed, and connected by a flabby flesh.
-if you decide to draw nails on your dragon, make sure they are curved at the end. This also applies to teeth. Also, dragons are often depicted to have A LOT of teeth, but you don't have to give it a lot of teeth
-the pupil of dragon eyes are often like slits. A simply search up "dino eyes" and you'll see what I mean.

These are some pointers. Hope they help a bit! ^w^