One of my favorite digital activities is to knock back colour images to black and white, then re-paint them by hand using photoshop. Not only do I like the effect it has upon an image, I find the process very calming.
Below is an example of what I enjoy doing broken down into it's various components. Now don't get me wrong, I very much like the starting image (taken a few years ago now) but as mentioned before, I take pleasure in deconstructing then rebuilding - probably a result a LEGO dominant childhood :)
Starting image taken on Whistable beach
A quick tidy up of the image with a slight foot change
Applied a black & white filter whilst lightening the model a little
Then step by step, painted in washes of colour
To finish, with a slight warm up. And an image that feels both real, yet not
Here's the final comparison