I love the classic anime, and I like the artwork from the manga, then the classic. The new artwork is nice, but it's not very consistent, nor is it proportioned correctly. Hell, this picture here looks way better than the artwork they're doing but.... at east we have Sailor Moon. And that's something we cannot complain about!
In the original artwork (manga) she is portrayed very skinny, like how most asians are-not being racist but most artists shape their characters in the way they see beauty. Skinny is gorgeous to them, obviously the girl eats. She just might have an abnormally fast metabolism like some people do.
~It can be natural to be that skinny because I'm sadly a prime example~