I find it interesting that you mounted the sergeant, banner bearer, and champion on larger bases. Any particular reason?
As for the painting, looking great, as always. A force of these guys on the table would be stunning, I'm sure.
Yeah, I was a little unsure on this myself at first. Basically because I am really just doing this for the modelling aspect, and not the table top, I figured I would give the more important members of the army (command squad members, sergeants, etc.) the larger bases, giving them slight hight advantage, and also, I guess a little set piece each to make them look more important than the average marine.
I do realise in a game that this would be a disadvantage, but as I am still unsure of if I will ever play an actual game with these guys (no gaming groups nearby, without going for a 3 hour drive to the nearest Games Workshop stockist) , I should put more effort into the making them look better, over performance.