Hard to tell from the pics, first thought is that it looks like the leftovers of a good fermentation/karusen. If it ends up with a still white film across the surface it may be infected, but for now I say it looks fine.
In the case of an infection, if it's caught soon enough a good option is to add some crushed Campden tablets (1 per gallon), let it sit for a couple days and then repitch yeast. The Campden will kill pretty much anything alive in there. Should be a last resort though.