Veeeery flat, no real light source except the brighter top-left, and if that is the light source it makes no sense in relevance to the renders shadow. Colours I like, but that shadow behind him needs movin' and some depth established.
The render definitely is not as easy as it looks to work with.. Even I tried it out. The effects are too messy and disorganized for my tastes the right side looks like a C4D very badly smudged and covered with a few splatters. It just seems a bit random. So work only making everything compliment eachother.