Animating Clouds in a Painting

So I am not an animator, but I enjoy reading and watching videos about the process. I have been playing around with two android apps: FlipaClip and Animation Desk. I took one of my ArtRage paintings and imported it into both apps as a background.  I painted in some clouds and did a simple cloud movement across the sky. I like the brushes in Animation Desk the best because they look more like natural media. The FlipaClip app uses the pre-installed Note Brushes for the S Note app. You can see the animations on my Vine page. Here is the link.
vine.co/u/1120478535186833408