Yes, I meant make the tall blocks lighter than the foundation floor. With four colors background can be tricky... maybe keep it as light as possible?

Hey thank you man! You mean to increase the increase the tone of the light portion the penguin is standing on right? I also think some kind of background might help with the composition, I might try that as well..

Nice! Perhaps decreasing the tone of the blocks and increasing the tone of the platforms would lend a more natural visual wieght. Also value-sculpting the polar bear's volume as you have done to the penguin would add a lot.