Yeah there's like over 6 different versions of the image. Some more NSFW than others. There are at least two versions of it though, that are safe to post. One where she's wearing a summer bikini and one where she's wearing a sweater.
The image in general is part of a pin-up series, and there are many variations of it, falling under summer, winter, and Halloween themes. Then from there, there are versions that mix up how revealed she is and whether or not she has the sweet smile or lusty face (I wouldn't exactly call it lewd), and the regular hairstyle or the ponytail.
...And if you're wondering how I know this, it's because I'm not joking when I say I love Rosalina in every possible way! :V
I do love fan art of her and I am down for
looking at NSFW art of her and reblogging it on tumblr (though I tag it so people can blacklist it if they want). Really, as long as it's well drawn and doesn't cross a few specific lines, I love any and all fan art of Rosalina, SFW or not. I wouldn't ever post NSFW art of her on this website or any website besides my tumblr, nor do I intend to discuss it openly (beyond this informative post).
Though, I always have been tempted to change my avatar to one that is a cutout of her face from an NSFW piece, and see how people react to it, as I know that people tend to do that and it's always funny. However, I've grown attached to the avatar I have.