But I personally think that you could push the colors quite a bit in your final image, it´s all in all too pale if you ask me. So maybe add in some more green, like this:
If you have Photoshop, do some Auto Color Correction or/and play around with your Hue and Saturation Levels. Anyhow, great great piece, love it!
(I can delete this post/picture if you would like me to for any reasons, no problem just contact me)