High-Detail Sand Dune Models

I need a set of 12 high-detail sand dune models for 3D printing and use as large scatter terrain.

Requirements:
- Varied sizes, both vertically and horizontally
- No bases required
- Scalable
- File formats: .stl, .3mf, and original files
- Shape characteristics: A combination of sharp edges and smooth, rounded surfaces

Ideal skills and experience:
- Expertise in 3D modeling
- Proficiency in creating high-detail models
- Familiarity with .stl and .3mf file formats
- Experience with organic shapes and terrains