Overall it looks quite good. But I'm a critic, so:
- Too many pictures on top of each other. Too crowded.
- The title text doesn't fit in, I recommend removing it.
- Upload it to a spam free server.
- Try optimizing it to a smaller size, took quite some time to load the 0.5 MB. Keep an eye on the quality though, it may not be possible to get it much smaller.
- If you make the vertical resolution 768 pixels, it would make a great background pic for most people (not me, I'm on 1280x1024

)
But it's your pic, do whatever you want with it. Looks nice, really.