Since I'm pretty new to planted tanks I didn't want to go overboard on the plants, so with the 2 medium sized pieces in there (or 1 large if I could've found it) it covers more surface area, which I like. Also since it's such a low tech tank the plants won't grow very fast which is good for me since I don't want to have to trim them and perform a lot of maintenance.
I'm hoping to learn a lot from this setup and once I feel more comfortable I may step it up a bit.
I like your tank set up! And I'm doing the same thing...learning and putting in only a few plants at a time.
Look forward to seeing how your tank progresses