Re: leading the eye in a painting
I'm unsure what you mean by "positive element".
One thing I always try to do it put large objects at the bottom which makes them look closer. I've realized that that method isn't the best. Make your "element" at least far enough from the bottom of the canvas so that it has "room to stand on".
I'm new at this, but that's something that definitely works for me.
Buddha suggests to those who need inspiration for their art to go before a perfectly blank wall until it's design, compostion, and subject reveal itself. -Jack Rutherford