We were encouraged to use our own memory and imagination combined with techniques we've learned in order to paint these. They were meant to be practice, not finished paintings.
The top right was done using the three colors with a wet-in-wet technique. The top left was a deliberate practice in painting mud by mixing all three colors. Ya don't know how to avoid it unless you know how to do it! The bottom left was a solid wash of blue and then color was lifted using a kleenex to get the clouds. A piece of rounded tape was used to block out the sun/moon shape and then strokes of all three colors were applied on wet paper using broad strokes. Once the paint dried the tape was removed (I forgot to wet around the shape to soften the lines before I scanned this in).
I switched between a size 15 Cats-eye brush and a size 8 round to do these landscapes.
Everything was painted on Strathmore's Aquarius II paper.