The One Behind it All

What an amazingly drawn Discord! You've never failed me as far as a wonderful drawing goes~
But I am gunna start out by saying there are a few things that caught my eye. The scales aren't very... Detailed. Unless you intended them to be very cartoon like, I would suggest adding some sort of reflection to shown me those scales are in fact scales. To me they just kinda look almost like fur. The horn on the top there looks fairly skinny, it looks like it's about to fall apart or break. Add some realistic thickness to the horns perhaps (that didn't really make sense)
It looks like you made his body parts stitched on kinda? I feel like they would look blended together outside of mlp since discord was created naturally (I THINK)
One last critique! The wing
The wing looks very unusable as far as a realistic animal (AGAIN I AM NOT SURE IF YOU WERE GOING FOR A REALISTIC OR CARTOON STYLE)
Wings are very similar to our arms and work very similar to wings. This wing would be very difficult to use for discord so you may need to look into the way you draw your wings. Look up examples and such it you haven't already

Now for the positive end, I saw some person said it looked unbalanced? Not at all if you ask me! The pose for the tail creates the perfect amount of balance for this picture! I really love how the tail looks, it blends from a scaly tail to a fluffy fur end. I am loving the coloring technique you used and I have never seen a discord like this one~ Your take on him is quite interesting