I... haven't seen this one before, have I? Hmm... It's not being uploaded to the usual place?Well, one has to wonder how things came to this. How did Rarity get shrunk, and stuck in a sock for that matter? (Or at least, what I presume is a sock.) Apparently Sweetie Belle has something to do with it, but... Well, there's enough ambiguity to make one think. (Or at least to make a Nurio think.) And that's a good thing. Clear-cut images are nice, but I love it when a drawing makes me think.It's probably my colorblindness, but I hardly see a difference between the two colors in Sweetie Belle's mane. I bet they're two completely different colors, but... Not for me.Rarity looks appropriately annoyed. Not too fierce, but definitely expressing her dislike for the current situation. (As it should.) Her hair also looks disheveled... I suppose that's what happens when one is in distress.The angle on Sweetie Belle's head looks a bit off. It seems to be an angle straight from the side. But with the angle of the clothes line, it looks like Rarity is deeper into the picture than Sweetie Belle is. Thus, Sweetie Belle should be looking a bit more into the depth of the picture rather than straight to the right. See what I mean? It's far from a big issue, and I only noticed it after some intense looking. (Yes, I look intensely at pictures when I need to critique.)I like the simplicity of the background. It does not distract from the main points in the picture, but it does add to it by making everything feel natural. Things far off into the distance do lose their detail, so it was a nice touch to keep it simple.Those clothes clippers (no idea what they're called in English) seem to break physics, though. They should be gripping the clothes at their thickest point... But the clothes more seem to float on the tips of these clips instead of being gripped tightly.The creases and folds in the clothes really make them look like they're being gripped, though. So kudos on that. It's not easy to make cloth look like that and make it seem natural. The clothes just needed to be moved deeper into the clip, and it would've been absolutely perfect. Again, it's not a big deal and only noticeable after taking a reeeaaall close look.Lastly, Sweetie Belle has a really cute grin. You captured that perfectly. However, it seems her row of teeth end quite early. I believe for most mammals, the row of teeth extend further than the corner of the mouth. This means that when one shows a grin like that, you should not be able to look past them into the mouth itself.All in all, I really like this piece, despite what my critique above might imply. It shows a great scene between a cute sister couple, and it's something I can definitely see happening for real.