I use DOF sparingly, I don't know how to control it, someone will probably have a tutorial to help you. As far as "sharp and defined edges almost as if I had cut the mountains and the dragon out of card and pasted them down on a background", maybe if you could post your pic so we can see exactly what you mean?

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy