I like the curves, but what's the brown?

Your craft in those brushstrokes is very detailed and visually intriguing, there's a little something spooky or sinister about how that Joker-like smile is in the clouds. But what's with the brown parts at the edge? Are they supposed to be there as part of the painting, or the frame, or are they part of the background? I'd suggest re-taking this picture and removing those edges if they aren't intended as part of the painting, or showing more and evenly if you want them to frame the image. Either way could work well, but half-way in between is a little distracting.