It's better than anything I've ever tried to draw of myself in the past few years. =) Love the glare in the eyes. Not feeling very 'critique-y' though at the moment... wish I could bring myself to say more.

3/4 view is hard. =[ It's good that you're practicing it when you're starting out, I stuck with only profiles and... I'm still stuck with only profiles. D= You're already like 10x better than I am in this viewpoint!
Critiques?
-His eyes seem a little big. Generally, with animals, the bigger their eyes are, the smaller their brains are - less room and all! I'd recommend making his eyes a tad smaller.
-I'd make the end of his snout a bit shaplier, myself. Generally, dragons seem to have a little nostril flare going on around their nose - I know you're hooking Nemms up with a beak, though, so I'm not sure how that'd work out.
-There should probably be a little more separation between his jaw and his cranium. You have it right now as a large circle behind his head - you already have some gorgeous shading going on where I'd end the jaw. It'd make something of a < pattern in the side of his head - you could also do this as shading instead of as a line, if you wanted to be realistic!
You've actually got a really good start here. I love how you shaded his snout! 8D And I like that you gave him a real prominent brow, too, as well as cheeks! And I also really like that his belly plates are overlapping and standing out against the 'air' on (my) left side.
8D I like seeing you draw Nemms, and I think it's great you're asking for critique! If I had my tablet on this computer, I'd totally hit you up with a redline, those help a lot sometimes. Maybe a little later!

Oh, all said above :P
But I think it looks good too, reminds me that I have to practicepracticeprac....

Very beautifull draw.

Not bad at all, I like it :)

All I can tell is... keep practicing.

If I may make a suggestion, try drawing still life. It's a good way to get a hold of the pencil and stuff.