Jenga Composition WIP

Working on my final project for my Shader Programming class. For it, we had to create a 3D model, composite it into a photographed scene, and make it appear to be part of that photograph. Can you tell what in this photo isn’t real? … Okay, it’s kind of obvious, lol! But what about it makes it look not quite real? (Besides the wacky shape; that was done on purpose.) Any nit-picky details will help.

In short, any and all critique would be much appreciated! Thanks!