Rule of thirds:
Imagine your picture plane divided into thirds in both directions. Focal point for the composition, ideally, could be at any point of the intersecting lines. Composition is more pleasing with the focal point off center, and never directly in the center of the image. This creates asymmetrical balance, rather than formal balance, and is more pleasing to the eye.
Just leave the impression of your subject.... Tell a story...My hubby actually came to get this, while I was painting it... Lunchtime. He did bring it back, though !!
