I also played a little bit with object-source lighting techniques, something I've been wanting to get more into for a while now.
For the most part, I painted him to follow the KemVar concept art up on the MERCS site. The minis on their site deviate a bit in their paint schemes, but I liked the concept art. The only real thing I changed was to make the green armor a camo-pattern. I did this because this team's speciality is an active-camouflage system, which helps out their evasion during battle. I thought it appropriate to paint their armor in camo-pattern to better tie into this.
Finding that camo pattern took me a while, though. I took a picture of three of the color schemes I tested out (leftover GW slotta bases make excellent proof of concept color testers). Each pattern had a combination of three base colors, a wash, then a glaze. I ended up going with the middle sample, as its effect was closest overall to the squad's canon green.