Well, the Ross/Alexander technique starts with you covering the canvas with a thin white oil medium, then you paint over that while it's still wet (hence "wet-on-wet). Kevin Hill mainly paints right onto a dry canvas more like a traditional oil painter. He still does the wet on wet for his skies thought. His style of painting is generally softer looking and more realistic in appearance. Ross's style is very vivid and sharp everywhere. Here's one of mine in Ross's style so you can compare to the painting above.