What I see immediately when looking at this piece is that most of the picture plane is covered in similar values. Pay particular attention to the fact that the figures and the background are mostly very similar in value. This creates a lot of competition for attention. Closely related to that is very similar chroma throughout the picture plane, and again this creates a lot of competition for attention.
I would like to see more variations of the yellow/blue and red/green interplay like in the top right and bottom left. Those passages are stronger than other parts of the background.
Strong points of the work:
*nice warm/cool contrast
*nice complementary color contrasts in previously mentioned areas
*nice psychological hook
*reminds you of a Gauguin/Picasso hybrid
When I first posted my comments, I was looking at this on my phone.
After looking again on a big screen, the value issue that I mentioned isn't what I thought it was initially. Having said that, I would still push for as close to a full range of value as possible. Some lighter lights would really give this piece a boost. More dark darks would also.