This last is actually based on bone microscopy but I like the way it echoes the circular theme of the cross-section of neurons. I coloured my drawing with pencils on tissue paper. The colours are ok but I couldn't apply enough pressure to get the colour intensity of the photo without tearing the tissue!
Here are a couple more pages in my sketchbook which I like. I have enough now to continue on with the next chapter of the module looking at texture.