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Why 10 nipples???
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Okay no but seriously, I'm actually interested in how different they look, is it safe to assume a lot of the fanart of the character is of them as a child/pup(W/e?) and the ones you've posted are them as an adult?
What's their typical age range in drawings/fanart.

(This is Pumori, because, she's the only one I really know.)

I'm not entirely sure when, but how I seem to remember it going is, that when I started drawing Pumori as a non-transforming werewolf (she did exist for a while as a 'dormant', human werewolf kid) I wasn't at all happy with her initial sketches, feeling she looked too much like a human top and werewolf bottom. So I started tweaking things that she had mixed aspects over her body instead of being literally half-wolf, half-human - one of the things I did to make her body look less human was to add animal-like nipples.

That's more or less how it happened.

Actually, Pumori started out as a child; I actually started out drawing her parents first, and a couple of drawings later they suddenly had their little pup. >.> Most of her early drawings were of her as a child, however in 2013 I did a time-skip on her. As a result, early fan-art of her depicts her as a child, while later fan-art also shows her as an adult.

The age of her in her drawings ranges wildly - the youngest I recall drawing her was three years old; the oldest I've drawn her so far must have been around 35-40 years old, although admittedly she ages less because of the Elven blood in her mix. Most of her drawings, though, show her in her 8-10 age range, and in her 15-20 age range. I've yet to post any of the former here, as some of the wordings in the terms of service and 'allowed content' are a bit confusing as to whether her younger art is allowed here. >.>

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... I hope that... answers things? Unless you have other questions?