Camera Work/Technical: This is a hard photo to pull off. I do like your depth of field use here, but everything still blends together. These colors are tough to capture, especially when lit this harshly.
Lighting: Your lighting is very harsh. This created some deep shadows that lost a great deal of detail. You did a nice job not blowing the highlights, unfortunately that darkened the shadows even more.
Composition/Content: The frame also looks cluttered the way you cropped off the animal on the right, as well as the way you have the foot touching the bottom.
My Opinion: I think that this one scored very well, most likely on the cute factor. While the image is nice for what it is, shooting at a different time of day would only make it stronger.
Personally, I'm not a fan of photos of monkeys and any of those other critters in the monkey family. But, this one clearly depicts the challenge goal, and has a nice range of tones in it.