This is quite a good aquascape now. Very natural. I think I may know what you feel you are missing though. The wood is lined up along the back which visually makes the tank look narrow (front to back) and emphasizes the length over the width.
To best explain my suggestions: There appear to be 4 chunks of wood from left side to right side, so I will consider these as 1, 2, 3 and 4 starting with the left piece. I would move #2 (the sort of "log") forward and slightly angle it, with the left end forward and the right end back. The piece of white rock will have to be moved, and this I would place over to the left of the other piece of rock; two or three pieces of rock in a sort of cluster looks more natural than spread out.
Having things like bits of wood closer to the front once or twice, and angled diagonally front to back usually increases the perception of depth. As you experiment with the above a bit, try not to move the plants until you are satisfied with the wood/rock placement. I'm envisioning the left end of that log to be roughly between those two front substrate plant groups, if that makes sense.
And welcome to Tropical Fish Keeping forum. Glad to have you with us.
Byron.