Wow, it was difficult to remove that red. Didn't have much of a picture left afterwards :(
I used the color as an exclusion layer and or color layer.
The line reads "of this still life" from that Imogen Heap pack I mentioned earlier.
Following a tip I read in a tutorial community; I placed it in my Patterns folder and used it as a flood fill with the layer set to screen. It's not as flexible as creating a brush from a selection, but it's quicker.
The dotted line wasn't created by me. I used a brush by (IIRC) _euphory as a stamp.