For starters, the last 2 pics are moss. These are generally tied to rocks or wood, not placed in the gravel.
Starting over at the top, the stems can be placed about 1 inch apart in groups. To get rid of the bare bottom of the stem, carefully pull them out and trim the bottoms off and replant. I would recommend getting many more plants for a soil tank. Crypts would be a good plant as they seem to really enjoy soil tanks and can handle just about any lighting. Plus, they are readily available just about everywhere.
Pic #7 looks like anubias. These don't like being buried in the soil below the rhizome. Roots in the soil are fine, just not the rhizome. These are also generally tied to a rock or wood. It looks like some moss is mixed in. As the moss grows, it could cover the anubias and cause problems. I would try to pull out all the moss strands.
The grass plant (Lilaeopsis brasiliensis I think) looks pretty good. I can see some new runners. This one is a slow grower and will take time to carpet your tank. Again, I can see moss strands mixed in. Try to pull them out.