Thanks! I love using clear lines, which I create with small strokes instead of long ones, so they are easier to control. The bad thing about this is that the sketchiness of true free-hand is lost, making some things (like hair) look too stiff.
I love adding things like freckles, blushing and tan lines. They are there in the real world, after all, so why not include them in pics? I always miss the different shade on hands' palms... Not always so obvious, but with darker skin tones, this is more evident. Perhaps one day I will manage to do this without forgetting.
I try to be faithful to the characters' designs (including hair style). I may sometimes add details to make them slightly more realistic, but staying true to the originals.
As for expressions... You may have noticed I do not create a lot of "battle" pics. Lots of people already do that. So I go for scenes when the characters are not fighting (I think this is the case with the other artists here, as well). So, whatever dynamism is not shown through action poses has to go to the faces. Some expressions are milder, of course, as they cannot be ham acting all the time.
For Rudger's face, I did go for a nose that was larger than the tiny one he has on the official portrait. Though perhaps I overdid it. Still, I wanted him to be very light blond (lighter hair than Amia's), tall, muscular, with eyebrows that were only slightly visible and a long nose. I have seen some military guys who look similar to that, so that is what I went for.
As for Anne's lips... That thing is something I draw that is meant to be light reflection shining on the lips. I just realized this time, helped by the not so vibrant lipstick color, it just looks like something pasted on her mouth... I guess I should have made it more discreet.
Thanks for the comments. All of those pics are already at my deviantART gallery (link is in my signature) and on Blogspot.
Edit: As for another detail I added. Huey has a vaccine mark in his arm. I thought they would still be using it for some other diseases or something. I included it to show that, at the time of this pic, Huey had not died yet, and still had his intact original body (since a new, cloned arm would not have that mark).