Easy, basic clouds.

 Even though these clouds are easy, they can be dramatic! Most of the time the backdrop should not over power the layout itself, so no dramatic clouds today. These clouds will be made in a few easy steps.

Put a blob of white paint (I use to me paint) in one corner of your paint holder. Load a round brush by pushing one side of the brush into the paint.

Use the heavily loaded edge to create the upper, rounded top of several billowing clouds. Use light pressure for this step. Make each arc, of a bank of clouds, a little different. 

You will notice your brush is running out of paint at which point start under pinning the clouds with smudges of paint, using hard pressure until you have exhausted all of the brush's paint. If you press even harder you can create the little, fluffy clouds like the ones on the right. You will see in the above picture that this application seems darker and less defined, and your cloud already looks not to bad. You my notice, at the top right I have two parallel rows of bright cloud lines, don't do that! These bright edges, caused by the sun shining on that side of the cloud, should curve down, as you see below. You should let some of the blue sky show through in some areas, to give the next bright layer a darker backdrop.