[Help] Track Villefranche de Lauragais FRANCE

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Hi everyone !

I'm making a track located at Villefranche de lauragais in FRANCE, I have some issue with the mapping.

How do you create a realistic texture, I'm using Photoshop(This is my texture)

Texture image
I'm not good at Blender and I got some issue to duplicate things like trees, also I have create a simple structure and I don't know how to import texture into MXB. Do you know good tutorials?

Structure image

I want to create a good atmosphere to my track do you have some 3D crowd or things in link with motocross?

I give you the track in the current state of progress:
https://drive.google.com/file/d/18xqzyRuNcenc4lvxK6P3gPl7BwmcGssY/view?usp=sharing

Thank you for your answers!