seeing your tree, you do have some perception of detail. rember, although some people are lucky enough to be born perceptive, to draw, you have to train your eyes to see, not just reaconize what you see.
what that means is you can just look at something and regester what it is, and some fine details about it, or you can look at something and take in only the details, not the emediate registration. one's brain often fills in what you see with mental associations about the object.
don't worry if that sounds wierd, just keep looking at trees and you'll see it.
as for the orginizing the objects, when making a graphic of something, it is important to reaconize the dominant shapes and details, what overlaps, etc, and draw it accoordingly. Using the wonderfull layers that programs such as 'jasc paint shop pro' and 'adobe photoshop' provide is a superb way of organizing your graphics untill you come to your final composition. you'll find that it'll making graphics will go alot quicker if you use layers.
Good luck with your art
