COMPOSITION...First off, I think the background in this photo is excellent, non-distracting but colorful and I really don't think it would be the same with a simple-toned or duller background. Vertical cropping also suits the subject pretty well. I like the fact the exposure has made the mosquito very dark - in fact I think it would have been a stronger image if only the form of the mosquito was defined (mosquito being pure black)... I think the only thing that perturbs me is the fact that the mosquito is just floating there in a sea of colors without seeming to be flying or anchored to anything (because it is in fact, resting on glass). Otherwise it is a very creative and technically difficult submission.
TECHNIQUE... everything good, but image quality is a little under average. Was the photo blown up a bit? high iso?
OVERALL... Unless you have gigantic mosquitos in CA, you managed to give to make this one look large and menacing :) The flowers give the shot an "outdoor" look and it makes a good entry into the fauna challenge.