I absolutely suck at aquascaping

[LifeIsGreat]

I like it, fills out the space better and has more of a 3D feel than your first go. I'd be gluing or pinning the vertical structure for sure. If you use cement on the rocks be aware that the cement will raise the PH of your water to lethal levels for about 2 month while it is curing, then a 100% water change will be needed. I cure cement in fresh water for 2 months then drain and switch to salt water. Glue will give you faster results.