I think its really boring.
I like it, the background looks good. There is a good amount of empty space, I like to just kinda keep it a certain way until I see something and think like "thank would look good n my tank."
Like I guess what I'm trying to say is u can always add to it, no big rush. I think it would look cool with something tall in it... It would give it some balance. Like for example Tall skinny decoration on left side, short fat decoration in the middle, and tall and skinny on right... Or short on left, tall n the middle, short on right...
If you don't want to spend $ u can do old glass bottles or jars (beer/liquor or cream soda/rootbeer if ur under 21 lol). Some cool river rocks or stones (clean it and google it to make sure it's aquarium safe)...
I'm sure you can find some decorations online for cheap too. Was on YouTube looking at aquariums today and saw a volcano connected to a bubbler that had a built in red LED light. That looked cool. Lights are a cool way to spice things up, or like I just said bubble wands or whatever.
Keep us posted on what u do with it, looks good so far tho