I like all the light, the spheres makes me think that this is a futuristic place but the rocks make a great contrast to all that illumination.
The color that you have chosen is perfect because it looks a bit more natural, it combines with the background but also does not take all my attention and I can also appreciate the environment.
I'm used to manage with few colors : two complementary ones plus black and white. Back in the days I tempted to work with multiple colors but I found it wasn't very efficient and a bit messy. Simplicity is the best most of the time. Orange x Light Blue is my fav' cw combo for sure :)
Thanks @yanes94 for this nice and constructive feedback :D :D