The leg to hip connection is indeed something I have been working on a lot and it looked good enough to post it. I might make it look better later when I have time again.
The rest however, what you're saying makes no sense to me. You're talking about some sort of shadow, and as far as I know every shadow on the sprite looks just fine. I looked at all the sprites that already existed, especially the skimpy costume with only the bikini to look if the shadings were right on that stop and in that, I saw no flaws.
Though I do have to say there there is barely any shading at all, or at least, very lightly.
Seeing when I look at Naija in general, the light comes from right in front of her and a bit from the top, her back is dark, and her front is light, which made the decision on where to put the shadows fairly easy.
And sadly enough, I have noone to pose for me, though I know enough about shadows and shadings. ^^
None the less, please show me with pictures what you exactly mean, if needed, in PM.
Also, Alec, It's nice to know that it's not a big deal for you, but I would also like your opinion on the mod, if that isn't too much to ask. D: