We agreed that I would do most of the modelling in the environment scene. I really enjoy working with modeling, it is so much fun. Even better when I have something to work out from, like the sketch they drew up of the environment. This makes all much easy for me to model.
For making the trees I had some options, I could use line tool and draw the tree, I can make a plane and shape after the tree but I choose to make a box and extrude out the branches or make wholes and drag out the lines.
I believe this method made the mesh cleaner. Under I added a picture of low poly tree and high poly tree.