WOW! Just wondering and wondering! This is the BEST picture you have ever made! I love how you coloured and shaded it! But it's evident as you are an excellent artist, who I love. Moreover I love the poses, the colours and the shading as these are magnificent, fenomenal, awsome, great, beautiful! I definitely give you 5 stars in all cases, which I won't regret, because everything is perfect in this picture! And since it's beautiful, you should draw the Rowdyruff Riders as well, because I bet that'll be as cool as this picture!
Did anybody else think of that Powerpuff Girl's snowboarding game that used to be on Cartoon Networks website? I sure did. 8D
Warning: this is my first "critique" on this site, so bare with me. D:
As for some critique, I notice that Buttercup's left foot (as in HER left foot; the viewers RIGHT foot) is not in perspective. It should be more horizontal, not diagonal. I understand that she's wobbling (based on her facial expression)? Even so, the foot should be more dramatic then, you know? Popping off to the side or even behind or in front of her. And it also seems as though the other foot is kinda awkward too. It looks as if you cropped a picture of her and pasted her onto the board. And now that I look at it all after typing that, it seems that's the case with all of them. Her right arm is a little too pointy at the elbow. And her hand should come closer to the viewer. Right now it looks a little flat.
Bubble's pose is also pretty awkward when she's on her board; it just doesn't look like she's riding. It's a great, dynamic pose, none the less, and completely fits her character. I notice some problems with the hands. You made them look a little chunky, especially her left one. And dat pinky is showing too much, whereas it should be more "away" from the "camera", so to speak. Also her skirt should be catching some wind. It looks like a tutu and tutu's are very flow-ey pieces of clothing, but I may be wrong about it being a tutu.
Blossom's left foot is kinda flat; there should be a small hump where the toe area is. Also the perspective of the cuff on her left boot appears as if one is looking straight down on it, where it should be slightly tilted downward, but not completely. Also her left hand looks a tad bit weird, I think it may be the thumb. Her arm should be further behind her. Her hair is also pretty stiff an should have a smoother flow to it.
The wrinkles in the clothing are a little non-existent. With the way they're positioned, it should be more dynamic. I'm too good at drawing clothing catching air, so I can't help too much with that.
Overall, I think you should look up (mainly) references for feet and hands; the rest of the anatomy looks fine to me. And you should also work on perspective, which I think is one of the things you have the most trouble with (heck, so do I!).
The things I really like that you did in this are: The poses and facial expressions. I think they really add to the characters and represent them very well. The coloring is also exceptional; I mean, it's REALLY good. I like it. The outfit designs are very cute, and I love how you added shapes that represent the characters.