Looks good! I am new to this and I am working on my aquascape right now as well. The only thing I would suggest (and everyone has their own opinion) would be to give more depth to the rock work. Offset one of your 3 pieces towards the back. I see the piece on the left is angled but they still look like they are all in the middle of the tank. You could also show us a picture from the side, cause maybe you do have depth but it just doesn't look like it from the front.
That's just my .02, but like I said everyone likes something different.