Concentration Ideas

After some thinking I came up with a very broad idea and am now trying to narrow it down. Here it goes:
-organic vs. industrial
-shapes
-movement in nature (ex: river)
-control vs. free flowing
-visual descriptions (ex: wind moving using texture, shape, form)
Off of that Christine, Katie and I came up with these moving subjects that could be turned into a piece:
-water -clouds
-light -flowers (growing, dying)
-moss/tree (sketch on previous post?) -thunder/lightning
-leaves falling -sound
-rain/snow -time
-bubbles -blood/cells/neurons
-waves -smell
-steam -planets/orbits (not a huge fan, but it might work)
-volcanoes

Concentration Sketches

These are a few random ideas for my concentration. The first reminds me of moss growing or creeping around a tree. The next two are the same with some digital changes. The combination of line and shape make me think of dust particles moving in the sunlight. Thoughts?

Summer Sketches

This summer I started a new sketchbook. These are a few of the drawings I did in July. Two are observational and the other is just some doodling. All the pieces were done with pen and ink.