I would remove the background, it's distracting, maybe a black background. Perhaps slope the substrate a bit to give some depth, more background plants and place the amazon sword in the middle to show off all its effect.
Here's a link to an awsome plant sitehttp://www.tropica.com/default.aspYou can't actually order anything from them, but it's a great place to get ideas. Looks good btw, but hide your equipment and terraform the substrate a little more. Not a fan of flat bottoms.