I'm assuming the little brown spec at the center of the picture is your insect. However, I would be hard pressed to guess what it is. The main focal point in your shot appears to be the cactus, not an insect.
I love the idea, and the cactus is very cool. But it's too hard to identify the bug. Also, it might have looked more 'natural' if the cactus was sitting on some dirt instead of a wood floor (or table).
I think there's an insect in there somewhere. Very hard to see and the out of focus area in front is distracting. The parts that are in focus are clear and sharp. ;)