[cyclohexane]

Good shots. One and two could be cropped tighter; the ref doesn't add anything in the second one, and could be removed while keeping the 3:2 aspect ratio. The third one's nice and tight, but I wish we could see the faces better; I'd try adding 1/3 to 2/3 stop extra exposure to bring out the faces.

All three seem to be exhibiting a certain degree of softness, but your high shutter speeds eliminate motion blur and probably camera shake as well. Also, given the fact that you're getting 1/3200 second, f/2.8, ISO 100, I doubt this is due to focusing errors, so my guess is either (1) how you're sharpening the files and (2) how you're compressing for the web.