I was pleased with how the Sergeant came out. His helmet took 3-4 coats of White Scar. I was worried about that because white GW paints are usually rubbish, but I managed to make it work.
Once I finish these other two marines, which I should do today, then I will be halfway through the tactical squad. I've started some work on the heavy weapon marines as well. The heavy bolter will be done fairly soon, but the rocket launcher will take longer to do.