Realistic 3D Mountain Environment in Unity

I need a Unity developer to create a highly realistic 3D mountain environment for a speed flying game. I have a 2D reference image to guide the terrain layout. Realistic geometry, steep slopes, and natural detail are essential.

Key Requirements:
- Realistic trees, foliage, rocks, cliffs, and water features (rivers, lakes)
- Accurate terrain based on provided 2D reference image
- Time-of-day effects implementation

Ideal Skills and Experience:
- Proficiency in Unity development
- Strong 3D modeling and environmental design skills
- Experience with time-of-day systems in Unity
- Attention to detail and ability to create realistic natural landscapes

Please share your portfolio and relevant experience.