I noticed this because I keep reenacting the pose from the drawing to check if everything makes sense. And I just couldn't get some things aligned the way they should be. I also think I got some proportions wrong. The wing should be way larger.
I'm browsing dragon pictures to see how people drew their feet (yes I'm still busy with those ) and just came across a design where there's a massive spike on the heel pointing upward. All I can think about is how this dragon will never be able to sit without impaling its butt.