I've seen all kinds of tanks done great with blue backgrounds, symmetrical decor, and natural colored gravel. It's really up to you on how far you want to go... (Low tech, hi tech) First off I would come up with a plan of how you want your tank to look like. Get some ideas from pics on the internet or here. Once you see something you like...plants, scape..etc. Start doing research on what you like and make sure you can creat it or sustain it....lights, co2, ferts.
Don't worry I though, in no time you will figure what works for you... That's the beauty of aquascaping. I started with a single amazon sword from petsmart, multi colored gravel, and sponge bob decor. I still have my sword and lost a lot of other plants as well. Lol
Btw I like your tank, keep planting.