I don't actually have a good full tank pic. but i can give you a little advice. Put your rock in first (on the glass) then the sand. This creates added stabilty for your rock. Depending on your planned inhabitance you should make caves and swim throughs big enough or small enough for the fish you plan on having. Big rocks on bottom, work up from there. Wedge them together, "pound" them down for more stabiity. HTH
How big is your tank?