That is a beautiful picture. May I make one suggestion? I (and many others) read everything from left to right because that is how I was taught to read and I "read" your picture from left to right and got stuck on the left by the beauty of those clouds. I only noticed the subtle right hand side much later. If you were to mirror the image the eye would then move from left to right as usual, but it would start with the subtle dark purple and end up with the brilliant golds. Your picture "Tomorrow Begins" reads from left to right and is better for it.
This critique assumes that you and your target audience read from left to right. If you read from right to left, then all you need do is look at your target audience and decide which is more important.