I'm not that good with critiques yet, but guess I gotta start sometime!
Anyway, first off, this artwork is AMAZING! The colors complement each other nicely, the drawing itself is near flawless, and the instrument (Chello maby? No, i don't know what it is, haven't don band in a while) is perfect for the goat. With looking at your other art, I see that you have a remarkable talent. If there's one thing I would fix, it would be to darken the background just a bit. I had to tilt the screen in order to see the smoke trails.
Thank You, Ghost