Long-overdue reply; sorry about that!
Didn't mean to just ditch our previous conversation... just procrastination.jpg
Yep, I love their dresses the most, not the lolis themselves. Nonetheless, I have no qualms about the beauties of Tinkle's artwork. I actually didn't know she drew RKB until shortly before the anime aired, but Tinkle was one of the first artists I memorised when I started remembering artists' names a couple years ago. And yes, yes, everything you mentioned―smooth hair strands, frilly dresses, ambient colours, and an overall highly, professionally artistic feel.
I don't know, but I'd guess such dresses aren't something to wear on normal occasions. They're too frilly and decorative to wear outside anything like a prom or a party. It's possible that you'd find 'em in Akihabara, but perhaps as souvenirs or collectibles rather than mere clothes.
Karory's artwork is quite distinct. Eyes, mouth shapes, facial expressions and the way she makes body proportions are all pretty apparent. As for Tanihara vs. Kayura, Tanihara's characters usually have stronger facial expressions (blushing, shading on cheeks and some parts of the face), and yes, more rounded too. Put simply, Tanihara's style is more moe, if you ask me.
I don't generally favour translations in general. I like reading but also have a tendency to nitpick and criticise, so I prefer to read everything in its original language where possible. For example, English isn't my first language, but if there's a literary work (say, a novel) originally written in English translated into my own language, I'll read the English version. Admittedly, it's not always a viable option as I don't speak many languages. And as far as I know, the Chinese translation community is better than English.