If you're not familiar with Ibarionex Perello's excellent blog The Candid Frame, please go spend some time there. He interviews some of the world's best photographers and it's great to hear their insights into their work.
Last November he sat down with nature and travel photographer Brenda Tharp, author of Creative Nature & Outdoor Photography . Very interesting to hear her take on the challenges of shooting out of focus, the lack of passion in her images when shooting for stock, and many other ideas.
You can listen to the entire podcast here or here.