I've never seen something that looks quite like this before, which makes it really fascinating to look at. It's an awe inspiring composition that feels classical, medieval, renaissance, and surreal at the same time. With the very detailed symbolic/mythological figures, intriguing landscape, and ornate framing.
There are a couple things I think could be better. The vines could use more detail and some tapering. They look pretty basic and blobby compared to the rest of the elements of the scene. Also I can see where you used a basic circle brush in the sky to paint the clouds that are farthest in the background, could use a bit of blending in that area to fade the ends of the strokes more gradually.