Nature based 3D environment for mobile

- A small 3D game environment - photorealistic vegetation / consideration for low poly overall in scene.
- This game scene will be entered into a pre-existing mobile app - made on unity.
- Deliverable? A complete FBX with all attached assets data.
- The scene is - A lake scene with forest and rocks and small mountains around
- Something like this - https://drive.google.com/file/d/1ZIKGnaFPCyjE00N32gsUlVh1mQry0-dr/view?usp=sharing
- And like something like this: - https://assetstore.unity.com/packages/3d/vegetation/trees/mountain-trees-dynamic-nature-107004 - Look at the video from 36 seconds to 52 seconds only. This video gives you a good idea (36 seconds to 52 seconds), what I'm looking for. Ignore the river section.
- I am trying to achieve photographic realism and at the same time I need this scene to not have too high poly count. I cannot have the phone lagging or overheating. This is important.
- Please note - The player (in the game) will not move around.
- Player will only look around.
- Therefore this means that designer only needs to build the detail around the player position (I have this on a map I will give you).
- I do not need the detail ALL environment.
- I only need detail around the player position. Then the rest of the environment is pretend detail. Illusion of detail.
- Designer is welcome to use their own 3D nature assets that are good for mobile optimisation.
- I can also share this 3D pack if it is helpful - https://assetstore.unity.com/packages/3d/environments/big-environment-pack-vol-3-13198
- Designer will create Sun and lighting, simple Water effect.
- Sunset scene lighting. Clear sky. Dusk. Sun on the horizon.