They lack sharpness. Maybe that lens isn't sharp enough for macro (I don't know that), but the fact that you've used aperture value of F32 definitely didn't helped here. Of course, you probably did that to preserve some depth of field.
Lightning is awful. You've used flash, right? Try to soften the light using diffuser - even home made will do.
Second picture doesn't give much clue to what I'm looking at... framing is uninteresting and it also lack some worthy moment, and I'm not talking about NG-worthy moment, but just being able to see ant's head looking toward you would give better result.
It's your first attempt at macro, so don't worry. If you feel that it's fun, don't give up and train, shoot more. I also suck at macro, so don't even give a damn about my comment