Oh my! Dayum, you're getting better at this, totally!
Though one thing you need to remember is consider collarbones! Not all creatures will have prominent collarbones, but due to the lung capacity and thus chest depth/dimensions, I've always thought dragons look -right- with at least an angular Y seam between the base of the neck to the pectoral muscles, same as a horse's chest. However then it comes up to the specific species as to whether it's a smooth hide/skin, or scales - that would take some of the definition out if they have plated chests.
Googleimages ref, for a good chest profile; http://www.grullablue.com/colors/ro.....lor/sabino.jpg

I'd also see dragons to be very chest-heavy, unless they have a WOPPING HUGE COCK to counter-balance. With the tail, of course. So as such would build plenty of muscle in the pectoral area; the prancing muscles!

I would suggest trying to draw things that exist in black and white first (or colour, if you are up to the challenge ^^). Once you learn how the muscles and skeletal structure work in real life, then you can take your practices and apply them to non-existing creatures (aka dragons, unicorns?, etc). It sounds like a long process, but you will pick up many new things quicker than you would think. Plus the more you draw it, the more detail vocabulary you will have. :)

Hope I helped a little with my 2 cents. :P

And good luck! :)

Looks awesome to me! I definitely think you're progressing in leaps in bounds. XD

In this piece, your lines in places have become the darkest point. Indeed, cracks and crevices tend to like shadows, but if you lower the opacity of your lines and THEN add your darks, I'm certain it'll pop out even more! <3

Greyhounds

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and
Hairless Cats

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I always enjoy either a horse or cat like chest...and cat or canine like haunches..but some nice lizard thighs like an iguanas are fun too.

Mix them up a bit to make them unique though because these are dragons..<.< not like..horses or cats ya know. >.>

oo lovely sketch =D

I like looking at pictures of bulkier animals when I reference, especially horses for the torsos and lions for legs.

Looking cool.
I think the wings could be higher up.

Actually, I tend to prefer to set my wings back a bit further than most people! I dislike attaching two independently moving limbs to the same shoulder, it feels like moving the forelimbs would interfere with the wings, and vice versa. So I started setting two shoulderblades. It can be done either with wings in front, or with wings in back. I personally prefer them back, but that might change when I start getting more intent into the anatomy again.

And that's why my wings are so far back! XDD

I was thinking along the lines of CG problems, if its supposed to be flight capable.

CG problems? And nah, those wings are much too small.

alrighty, then my objection is moot.

The anatomy is very good.

*paws at it*

You need to draw more, dragon.

Hmm. Are you still looking for feedback on this, it being 2 years old?