Refine Backyard Landscape Plan

I already have a builder-supplied draft of the overall landscaping, but the backyard still feels generic. I’m happy with the proposed plant palette, so the scope is purely about re-working the layout and features, not changing shrubs or trees... (Budget: $15 - $25 USD, Jobs: 3D Modelling, 3D Rendering, 3D Visualization, 3ds Max, AutoCAD, Graphic Design, Landscape Design, Lighting Design, SketchUp, Vectorworks)