1) Cool photo, but I wish more of the leaves were in focus. The bright white spot on the left is a bit distracting as well. This is my favorite of the four you posted though.
2) Nice concept, and kind of made me think for a while to figure out what it was (it's early and my coffee hasn't hit yet

). There's no color to really jump out at me, but I personally like images that show textures.
3) Would have been much more appealing with a lime that was cleaner. Plus, the leaf on the right takes attention away from the lime and the rest of the image.
4) This one was a little center-heavy I thought. Plus, I can't really decide whether I think too much of it was in focus, or too little.
Just my own thoughts. I'm sure others will have other/differing opinions. Keep on shooting. You've got some great ideas!