Hello Walter- The plants are all healthy and they look pretty algae free- congratulations! That's the hardest part! What you need now is some hardscape to break it up and make it look more interesting- I don't know if "hardscape" will translate, its a made up word used in this hobby to mean Rocks or driftwood- any decorative natural elements that aren't live plants or substrate.
When you go looking for hardscape, my best advice is to find rocks that are all the same type/color, and a color similar to your substrate, wood is an entire subject on its own as to what species of tree and bush you can use.. If you do a web search for AGA aquascaping contest and look at the pictures you will get a lot of ideas