Well, some call them antennae, but antlerthingies is certainly more entertaining.
It looks like you just had the misfortune of shooting that first one so that the nearest antennae was pointing straight at the camera and with a small DOF, it looks like it's not even there.
It's also a little soft, but considering what you were using, that's not surprising.
Are these crops?
The spider picture is actually pretty cool, but if it were my photo, I'd rotate 90 degrees and crop a lot of the top (currently the left side) off. But if you've already cropped it pretty severely, you might be left with too small an image to do much with.