I redlined the four-legged dragon for you.
dragon_redline.jpg [ 41.05 KiB | Viewed 496 times ]
-His body is a bit short, so I extended it
-His head is a bit too small for his body; I recommend making it larger
-When drawing something that's standing on a flat surface (like this dragon), it's good if you use a ruler to make sure that its feet are level. If you don't have a ruler, you can always use a book or something else with a flat edge.
-I really don't think it looks good to have both of his legs perfectly lined up like that. It's a little bit more interesting if you have the farther leg be in front of or behind the other leg. See how I've changed the placement of the two back legs.
-The wings should be held flat to the side.
-To clarify: the lower line on his chest is where the fur would end.
My redline is quick, so there may be more that I missed.