Sorry, I wasn't able to reply until just now. After looking at the picture, the only thing that bothers me is the succubus-like character on the right, but it has nothing to do with her attire (which is actually pretty tame for a succubus) but rather, the placement of her wings--they should probably be higher. The soldier's right leg (your left) seems to have the knee placement a bit off as well, but again, that's more an anatomy mishap than a problem with her attire. That said, the fact that you're exploring the possibility that fanservice is actually okay is very good, as many people with what seems like deeply-rooted opinions never once venture outside their comfort zone. For that, I applaud you.