Good choice of aperture - you got wonderful details throughout the entire image. Even though the lighting looks like it was a bit harsh you really made the most of it - it's not overwhelming at all. The texture and details of the sand really make this image pop.
Tiger beetles live on bright sand in full sun, so finding them in gentle diffused light is near-impossible. Love this pre-mating pose (nothing going on yet - first the male grasps the female with his mandibles, then part II which hasn't happened yet). There are little splashes of cyan here & there which these beetles have (thus the cyan is not an artifact). Outstanding DOF, focus, composition, & exposure!