There are a few things you can improve on! :)
I am gonna be really rough on this review, but I would like you to know that I do enjoy your artwork. I am an artist currently and mainly do abstract art, I SUCK AT ANATOMY. I do, however, understand the basic principles of art... but you dont have to take these words into consideration if you do not want to, im just gonna throw them out there because I feel you could seriously improve if you did it.
LINES
The main problem with this drawing are the lines . A lot of them are not bent very well and have a lot of bends where bends should not be. A prime example would be where the diamond is. If you notice, the diamonds outlines look very strange. Many lines in this picture really distract me from its beauty. You need smoother lines, in other words. Now, of course this might be just your style but because you are drawing anatomy focused drawings, you need focused lines that are not jagged. I would recommend a nice line editing tool whenever you go in to edit your drawing. Line editing tools can really help artists that find it hard to bend lines correctly.
COLOR
This one is fairly simple. I see that you are good with shading, but a bit more coloring and shading couldnt hurt at all. Your picture needs more depth, it seems a bit to cartoony. If you wish to do this then simply add more colors. Experiment with textures. for instance, look at a picture of scales and try to imatate the pattern on the scales of the dragon rather than filling in a oval with two greys and shading it. Or you could try experimenting with using over 6 colors in one. Many objects such as jewlery, hair, and skin really need this patterning and coloring because if they do not have it they look too cartoony and not very sexy. For the skin, try using many shades of one color to provide depth. For the hair try drawing many many lines so it wont look like a solid hair piece without strands of hair, which is what it looks like right now. You already have the talent and ability to do this, so dont be lazy! Go out there and try your best and it can be a masterpiece.
These are really the two main things you should improve upon in order to make your drawings incredible. Right now you are at then intermediate point, and soon you can go into ADVANCED where you could start drawing for Magic the gathering or an RPG game or do illustrations for commercial businesses. Good luck to you! And i hope my "advice" helped somewhat. :/