Keeping in mind that its hard to get the full effect from a photo over standing in the room, but I think the room will become too dark staining the yellow as the green seems dark in the picture, so perhaps you could use your furniture and accessories to make the room more cohesive.
Use the lighter colors against the green and vice versa on the yellow walls. Another thing you could try is using the same drape style but a different color on the green wall...in the photo the green drape really pops on the yellow but seems lost on the green...(and I assume the other yellow wall is getting the same window treatments) I was recently in a house where the decorator did that type of treatment..same style/different colors and it looked really nice, you just have to make sure all the colors used in the room dont become too "patchworky".
I think Bradnailer is right...it looks good..you may just need to finish it and give yourself some time to adjust to your new color scheme.
Good luck with your project.