Crop away the tree and the upper bit of sky to have an abstract diagonal shaft of light and dark. Keep the tree and have an interesting perspective of two non-abtract objects. Yes, a cylidrical shaft can have phallic connotations, but I suspect depending on the title so heavily will not be rewarded very well in an "abstract" challenge.
A very out of the box shot. More abstract in concept than appearance. I do like this. The man wearing the hat and the women with her wavy hair? (no vote)