awaiting trim & more photos...
I agree, "thin plants" would not be good here, but a trim would be -
DW has a bit of "knitting needles poked through balls of yarn" look in most recent photos. Some careful trimming in the lower portions might bring it back from "tree" to "trees".
The plant in the rear (right) is almost totally hidden by the right front plant (as is a little too much of the large rock). Just a trim, not a major "thinning out" may add more height via hardening the contrast between the rock & plants on the right.
I'm not even sure why I offer constructive criticism when i think my own large tank looks like a wall
in front of a field in its current picture (I've improved it a little but have no new photo yet), but there you have it.