Here is my step by step tutorial of how I turned my artwork and improved it. I won't show level of difficulty or the final product at the top of this page, because I know better than some how that can unmotivated to be better.

Here we go, Step 1: Draw the basic shape of your dragon, without limbs. Sketch skeletal structure.
My personal goal today was to make my dragon more realistic, and with more muscle definition to it didn't look so flat. I find sketching the skeletal structure out first helps make sure your joints and position is natural.

Step 2: Find what about the reference I want to change about my art.
I wanted mine to look more realistic, anatomically. I outlined the joints in my reference picture below, and then drew that onto my dragon with my style's modifications.

Step 3: Continue changing joints in the wings.

Step 4: Use a third color to outline the whole idea.
Remove everything else for the outline to stand out with your finished idea.

Step 5: Add details and finish, even if it's as a rough sketch. I used the reference again to find and highlight the muscle definition.

Step 6: Color!

Viola! We are done!