i liked #4 the best. the plants look real and has really beautiful pieces of driftwood. could use a vertical piece in the back though.
#1 has these emersed plants near the top that looked like they are temporarily placed there. they look kinda smooshed since i think they are supposed to grow out of the surface not under the surface for longevity. tons of negative space.
#2 has plants that are distractingly fake and a fake background(?) though not necessaryly distracting.
#3 really cool 3d background but i like planted tanks more