Good attempt at a macro shot. Your subject is cropped too much in the lower left and I don't think that the negative space of the bark enhances your composition.
Nice shot... more DOF would be good (but I know from my camera I can't get that kind of control)... I think a 180° rotation so the bug was walking out the top of the photo would look slightly better. Good luck with it.
Looks like most of an ant. Definitely would've been much more effective if you showed the whole thing. This would be almost effective if he were going up instead of down.
Nice texture and I like the negative space idea. The bark on the lower right is a little overexposed, but I'm not sure there's anything you can do about that. I think I'd like to see the whole bug rather than the bottom cut off.