Now, see you're so lucky!... I have always wanted to paint, but can't even do a fair water color or crayon work. So I have taken the camera and made it be my outlet of expression, and inner creation! I can use the camera as an extension of my mind so to speak and bring to life the images that I have always wanted to paint!
With you being a painter, well the possibilities of excelling in this field should be easy, once you master the camera and light!
One big point I can tell you right now is always try to shoot with a tripod... nothing can kill a great shot more than camera shake or movement. You want the image to be crystal sharp! Composition will be easy for you with a painters "Eye". and shoot lots of pics,it's digital, you can always delete them, but you will also learn from these bad shots as to what was done wrong!