Hi, yes I've used MyPaint since 0.5, it's really encouraging that it's seeing more adaptation among more people these days.
Thanks for the critique! The contrast is, as you say, pretty much a matter of personal preference at this point - if you look at the linked WIP series of images at the top, you'll find that I already upped contrast in a few steps from the original "raw" painting.
I see what you mean about making the fisherman more visible - the reason I didn't make him stand out more was originally since I didn't intend him to be the main focus of the image; in a way I like that one might have to do a double-take to spot him on a first view of the image.
Thanks for the feedback and fave!