I've gone ahead and done a crude sketch of what I'd imagine this scape as being.
The greenish-yellow would represent either glosso or HC, whichever you'd like.
The curly green plant behind the rocks would be Blyxa. It'd fit the scape so perfectly.
The straight plant along the back wall is DHG (Elocharis parvula/belem).
I'm very jealous of the scape, to be honest. It's got so much potential. Make it great.