I agree with Ovyx, in that additional shading could definitely help define forms. Right now it seems a bit hard to understand. The crossed-arms look a little weird, too, like they're not actually crossed but rather joined somehow. It also took me a moment to realize those were blushing cheeks. That color seems to stand out too much. Consider placing it with pink or the blue you used in its/her mouth. Overall the whole thing seems... Deformed, somehow. In a slightly aesthetically grotesque way. No offense. Even if it is a style I can't say it's perfect as-is.
Also, what makes this so "cactus"-ey? Are you going to add a cactus-like pattern, maybe thorns or a cactus flower later on? What?