51 Playful Pink and 52 Rebellious Red are new shades to the Rouge Artist Intense Lipstick range, which features full-pigmentation lipsticks with a creamy (but non-shimmery) finish. Meanwhile N51 Naughty Nude and N52 Coral Confident are part of the Rouge Artist Natural Lipstick range, which features a more moisturizing formula, but is also more sheer (although with MUFE, sheer is a relative thing, certainly you can build even their Natural lipsticks up to near opacity with just a couple of coats).
Without further ado, here are the swatches. 51 Playful Pink is a more Nicki-Minaj-esque kind of pastel cool-toned bubblegum pink, which might be a bit hard to pull off for some warm-toned girls. 52 Rebellious Red is a chili red that's ever-so-slightly warm-leaning. 51N Naughty Nude is a rather interesting salmon-pink-coral shade (I didn't really know how to describe it, sorry). N52 Coral Confident is similar to N51 in that it's also a beige-ish pink, but it's slightly more pink and slightly less coral.
Swatches of the MUFE Rouge Artist Lipsticks: 51, 52, N51 and N52
My first impressions of these when swatching are that they are pretty much like the other MUFE lipsticks that I have - which is to say, the quality is excellent as usual. I believe I've stated my opinion that MUFE is one of the few brands with excellent products across the board a few times on this blog before - in my experience, pretty much every MUFE product I've tried has been good, and chances are, if you throw a rock at an MUFE display, the product it hits is probably pretty good, too. I hope to review these soon, if I get around to it!