I think you may come out fine. The first time I nurtured a starter, it was a jar given to me by a neighbor. Her brother had given it to her over a year before and she put it in the back of the fridge and forgot about it.
When I got it, it looked and smelled really gross. And there was some sort of black crap around the lid of the jar. I scooped out starter from the bottom while holding my nose and gag reflex and began feeding it a couple of times a day (morning/night)
After the first 4 or 5 days, I think it looked like the picture you posted. And, it went on like that for another couple of days. The, suddenly, "it was alive!" in that it started growing much more vigorously. Within another couple of days, it was doubling every 4 hours.
I would recommend you keep going for a few days and see what happens.