Adam_MA

Well,
I think you would do well to start some basic cleaning out of this tree. By cleaning out you will be getting rid of some of the growth to allow us to get a better look at the tree. It's kind of hard to make out any branches right now. For instance, in your last picture there is a ton of new growth close to the trunk and soil line. This would be a good place to start. Also if you have any "Crotch" growth (new growth that starts where the branches meet the trunk) you would do well to thin this out as well. I would warn you against making any branch cuts at this time. Until you have the tree cleaned out and you can see the structure it is hard to tell what stays and what goes.
Once you have the tree cleaned up, place it near a plain uncluttered background, and take a picture straight on. You are sure to get some good suggestions once the tree is cleaned out.

I hope this helps get you started.
Adam