Since nobody else really wants to, I guess I'll take a shot at critiquing my own work. I guess that's kind of the point anyways, right? To learn to look at your own objectively?
The stone is pretty good, lots of interesting texture and color in there. It's placed tolerably well in the frame, but it feels like a little more right or left might have been better.
Overall it feels a little dark, perhaps the contrast was pushed a trifle too high? The yellow flowers in the foreground are distracting. Possibly a slightly higher angle to push them lower in the frame would have been a good choice. The colors are a bit much, a trifle of desaturation would probably help this out. Possibly a little oversharpened, the highlights seem to crackle a little more than is strictly speaking natural.
There's a moderate to weak visual center, at the small in-focus yellow flower and its shadow. There is some eye leading with the edges and cracks in the stone, but not very strong. The visual center is not particularly fortuitously placed, being only a little off-center feels like a weak position, the eye has to hunt a little to settle on it. The grassy background upper left is a little busy but does work as negative space, with the exception of the distracting elements at the very top of the frame in the right hand third. Again, a slightly higher angle would have helped that.