Nice effect Lifecapture - Editing in this fashion is also possible with other software and I quite like the decisive nature of the eraser tool. Artists frown on the use of erasers as every pencil mark counts as they build an image on paper; I personally think that editing photos is completely different (the reverse) and I use the eraser like a pencil remodeling/building the new image with decisive strokes - Though I always keep a copy of original photographs

Regards
Andy