The layers of paint create texture and dimension. I love painting with acrylics because when you mix the colors together, they blend to make new colors, but at the same time tend to resist one another which creates cracks in the paint. I apply mine in think fluid drips, then dry brush so they are true tones rather than watered down.
The marbled effect, along with the cracks, creates movement and allows your eye to flow freely throughout the painting.
Again...it's only 5"x7"!
Where would you put a painting of this size?