I agree with dela. Need a few stems over the back right to hide the pipes, other than that it looks pretty good! I notice some algae on those big leaves, cut them off before it gets a good foot hold in the tank. I'd also cut your stems on the left to take the bend out of them and to make them bush.
Move the big grass to the back left so it grows up and folds over the top of your stems to cut abit of light on them (will cut the growth rate down abit and make them easier to manage.
Some S repens would look like in a row across the front from the right edge of the rock to abit past the left.
Also the plant over the back left (rotala round? Not sure) should be seperate rather than mixed in, makes it look a little messy. I'd cull some of the other plant to make room for it.
As the plant behind the rock/lily grows out more and u have some trimmings to play with I'd wrap it around to the left of the rock so you get a nice change in leaf size between that and the other plant.
Just a few suggestions but it's really up to you
your the one who has to look at it every day