Hey Hydra! It's Weasl.
I redlined your ADORABLE picture a little here, if you dont mind. I wanted to help you just a tad with your dragon anatomy.
I've redlined what the skeleton might look like. Here, the redlines show the major/important bones you sketch out when you draw. A head that tapers down, the long, flexible spine, a ribcage, and then the front and back legs, (which are there in the redline). Here's a reference that helps me out: http://visual.merriam-webster.com/images/animal-kingdom/carnivorous-mammals/dog/skeleton-dog.jpg
It's a perfect thing to study. Test yourself, on a blank peace of paper, to see if you can roughly sketch out a skeleton without looking at the reference. Then compare a reference (like the one i liked, or some other bone structure that suits you) to your drawing,and see what you need to work on. Do this often, then you'll know an animals build-up well in no time
(This is how I practice) You can do this also with muscles, and anytihng you want to improve. Because anatomy isn't just the skeleton, it's everything about the body, etc., right? But this is justhow I think you could start out.
And I saw that you don't really like using cat anatomy, and that you like a more "lizard-like" dragon. I thought about what anatomy you could use. And I thought of the perfect one: Dinosaurs! A good amount have a sleek-like body,a lean, but equally muscular built body, and pretty much the same bone structure as mammals, wellalmost.(I reference off canine anatomy myself) I would recoment using the front legs of a cat/dog though, so that they look a bit more "dragon-like"
Hope I could help
You've got so much motivation and patience, and, trust me,
this'll help you a lot with you art. keep up the amazing art work, Hydra