You've caught the difference between these two (as written) very well: Betty looks wholesome; Ronnie, a little more sophisticated and maybe ever-so-slightly fake (or, put another way, Bettie's just being Bettie posing for a photo, while Veronica's hamming it up a little).
Creepy? No. I look at this as a BIG F-U (if the pic is from Archie's POV), saying "yes, Betty/Veronica is my girlfriend now." ;3 Why those two fought so long over some silly boy... Perhaps it was some natural rivalry between our ladies? They were/are so obviously meant for each other! LOL!
Plus, you have to admit Betty/Veronica is a hot couple.
Yup, I'm old. Betty used to wear little white gloves to school back in my day. This of coarse juxtaposed against her puny bikinis while at the beach - often in the same edition.
Oh yes, and very good idea giving Veronica a differing skin colour to Betty. The story is that Betty and Veronica are actually identical save for clothing and hair. Interesting how much of a difference that actually makes.
Well, not sisters in the story line but in artistic conception I suppose. The artists probably started doing it to save time in the early days and the practice simply stuck. Or its a long running metaphor that Betty and Veronica are really two sides of the same coin.