That early concept art looks neat, but I have to say I do like the white fur on the VT1 skin, it adds nice contrast. It’s also why I like the champion skin a lot in VT2 with its rust red and green colour scheme (if only the hood would match, sigh…)
As for the height thing, I’m having a harder time explaining that - it may be new body proportions, in VT2 Kerillian looks quite ‘long’/elven, kinda like how Total War portrays elves (Morathi is an easy example to compare with considering her… lack of concealing garments), they have pretty long upper legs especially (and midsections/arms and lower legs too to an extent) compared to humans.
I can’t comment on how tall Kerillian looks vs her surroundings in VT1, but in VT2 her old and new skins are basically the exact same height - go measure her up against a door in the keep or so. The only thing I can think of is that her VT1 skin has a lot more fluff about the shoulders due to the mass of furs, whereas her VT2 skin doesn’t have so much in the way of stuff on her shoulders and also she at least seems a bit more hunched over in stance in VT2.
A large part of the bulk of her VT1 skin in general seems to be how padded out her armour is, her VT2 clothes are much thinner and have less on them.