just uploaded my gallery and some images were rejected. Could you give me your feedback?

It seems that the DOF is too shallow, causing only a tiny sliver of these assets to be in focus.

Not to be glib, but I think the jumping spider needs to be more "macro-ish." I'd like to see a tighter shot. Maybe some cropping will help, if the original image is large enough. I've investigated getting a jumping spider for a pet, and the images I've seen are of the spiders taking up nearly the entire frame.

Your first: a light underexposure, not focussed, very narrow DOF (sure, it's a macro asset), and noisy.

Your second:

• considerably underexposed, as shown by the histogram:
   
• very little DOF, even that the eyes are focussed
• still some noise, but not as strong as your first
• maybe some chromatic aberration.

With both assets, I think that the DOF is an issue. With the second one you could try to correct the exposure and resubmit, with the first one, as it is not really sharp, I do not see much possibilities, as the missing sharpness can't be corrected.