It might be pointless to point out that normal things do exist on deviantArt (aside from people taking photos of random people, animals, and scenery). Regardless whether it's true that it's dominated by art that's anime (personally I haven't found that to be the case, but that's because I don't search for that sort of thing) or art that's off-kilter, that's the sort of thing that will stick in our minds.
Just for the heck of it, I looked up "Mario and Yoshi", hoping to find some cute normal picture of those two. Nope. But I found these:
Mario the Renaissance ManMario's the King of Gaming, he's winding up a Sonic-In-The-GameCube-Box.
Mario comic compossed sceneAwesome fanart of Mario, Luigi, Peach, and Yoshi as they somewhat appear in the movie. Except it looks good this time around.
YoshiYoshi in a stylized semi-realistic (in that he looks more like a dinosaur than usual) form. Almost looks effeminate.
Carrying YoshiYoshi's riding on Mario for a change. Although this idea
has been drawn better, this one's funnier.
Yoshi-FlailsSelf-explanatory. Mario using baby Yoshies as flails. Comic gold.
I deliberately didn't link to one comic where Yoshi's traumatized from being forced to eat a Koopa Troopa and Mario's being a jerk about it. Because, you know, that'd reinforce that deviantArt has off-kilter art.