The first image is of Layla in believix. Her eyes seem different and her lips are fuller (BTW for those of you who are thinking OMG Stars_and_Fire is SO stupid and this is FanArt...it's not FanArt, it's the official concept art)
The second image is Stella in her normal outfit. If you ask me, her hair looks slightly different. Her lips are also fuller and her eyes seem slightly thinner... (very slightly).