You are confusing striations with dryness; they are two completely different things.
yes but you cannot have the level of detail/striations that Ronnie displayed in 99 and be holding water.
it just doesn't work that way.
Ronnie was so detailed he looks like an anatomy chart:

other than the lower back and abs, you really can't say Dorian has that same look.

hence, ronnie appears like he has no skin.
dorian appears like he has skin but that he looks more statue like.
Most would say that supreme detail conveys dryness better than the statue type look.