The round one looks great. I think I get too impatient and don't let mine rise long enough. I've finally resurrected my abandoned in the fridge for two months sour dough starter. My sister was asking about some so I finally dragged it out to throw and start again but when I took a good look it was really only black hooch not mould on the top. I've poured that off and scraped away the top grey stained layer and have fed the nice cream stuff that was at the bottom. It's got bubbles forming so think there is life in it yet!