Well missing textures and models on my side, like everywhere xd You need use something like vide it usually automatically pretty well detects all custom textures from map so you can add them directly into bsp file.
Either that or...
I guess you are using CS:GO content, I recognise these trees i think, if so you should let people know that CS:GO needs to be installed on pc in order to see content, I personaly dont have need for having it x)