I'm not sure. He's been inactive for a while. Which sucks.
I suspect he applies the highlights with a brush and adds water to desaturated the paint so it fades better. (which is definitely something I'd be afraid to do.)
I have some experience with using various mediums. For example, [url=http://farm8.staticflickr.com/7311/9713687746_fce4933ce0_b.jpg]this sketch[/url] (which I can't finish due to having lost certain markers =[ ) was done with markers,colored pencils, and acrylic paint. But foam is a lot easier to do than clean highlights that fade smoothly.
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OH I REMEMBER YOU You showed me that photo and the water, even seeing it and looking at it several times, is amazingly gorgeous. The strokes are so smooth and delicious I would suggest grabbing a huge piece of paper and just sectioning off places to test how the medium reacts to each other. Experiment and then when you think you have it down implement it into your actual pieces. Trying out new techniques on your art is really intimidating, but setting two or three days a month aside to play around with your tools can really help you better understand them without the fear of messing up a beautiful piece.