This is a beautiful app, however it is as yet (v.1.0) only catering to novice users looking for a quick result with little control over the finished render. These magical algorithms deserve much more user tweakability... Include an advanced tab maybe?
I would personally love to see more line control options as this element is the least convincing part of the sketch. Adjustments for color, sparsity, opacity and even removal of the edge lines altogether. Also how much unfinished white is left in the image, sometimes the white patches are in the wrong place and can't be dealt with, a sliding scale could also control how 'finished' the artwork is, as EvenSteven66 suggested.
Anyhow this is still the best watercolor app ever! Keep up the good work, looking forward to future improvements...
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