I think it looks great. You have enough open space now for the Discus to graze, but I'd take down the depth of the gravel in the open space so there won't be so much depth for the food to work down into. This will help the Discus graze, and help with the gravel vac you'll have to do on this area. To take the depth down here, you might consider a rock reef, or some more small pieces of drift wood to hold back the gravel behind. You could also put in a temporary grouping of rocks, and wait until the plants develop enough roots to hold back the gravel.
Things are going to grow so you'll have fun aquascaping as it changes with the growth. It should really look good in a couple of months or so!
The CO2 will take the pH down to a good level if your kH is not too high.