Are these all live plants? They're beautiful And is that Java Moss on the left? I love Java Moss If you'd like to hear my opinion, I love the way your tank looks - it's very nice. But if it were my tank, I'd replace the artificial decor for natural driftwood and I'd grow Java Moss on that driftwood. Java Moss loves to grow on driftwood and it looks beautiful when it's grown all over a driftwood piece. Also, live plants and driftwood only, as a decor, look best to me personally because they imitate nature best In my 75 gallon tank, I'll have live plants and driftwood only (plus maybe some rocks), and a naturally-colored gravel (or even very dark gravel). However, if you like artificial decor other than driftwood, its totally up to you As I've said, your tank already looks beautiful.
Look at these tanks (they may give you some ideas):
All of the above pictures are on PlantGeek.net - they're all stunning, aren't they? That's what I mean by an "all-natural" tank. If you want to look at more photos, just browse the website.
P.S. If you decide to use driftwood, be sure to ask on Fish Lore about which driftwood to use and how to prepare it before putting it in your tank.