Abstract Tree Collage

Had an idea to make a series of images into pictures for my front entryway. These shots are single frame close-ups of different parts of a tree, top-to-bottom and left-to-right, assembled in Picasa. I'm going to continue fine-tuning this technique and then make a series of separate 8x10's for my wall. Appreciate any comments or suggestions or samples on how to make this work. Thanks folks!

1. Overcast morning sky, slightly overexposed. Converted to B&W with some more PP. Hand held.

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I like #3 the best , but I believe that the bottom picture should have the same sky as all the others. As it is, it seems to distract from the central picture.