Outside In (architecture)-[foliage]

I’m trying my hands at an architectural model of Outside In in Portland, Oregon. I’m staying in Missouri for a few months, which is why I’m limited in my reference images to Google Maps http://g.co/maps/tqzva So far, it’s going smoothly, but I’m dreading the foliage. I wish I could afford The Nature Academy. Does anyone have a recommendation for any free nature tutorials? Also, critiques on my work so far would be highly appreciated. Thanks.

-Brandon Farley