It's possible to see that Ivan’s drawings are so “pale and timid” compared to Julia because, unlike her, Ivan lives in a very small domain. In his domain, there’s not a lot to draw besides garbage, and he doesn’t seem to have enough mental stimulation to draw things out of his imagination. His captivity, in this sense, is stifling his creativity. But this doesn’t mean that his drawings aren’t still valuable: they sell for up to $25. But Ivan also implies that the drawings are valuable in part because many humans underestimate what Ivan is capable of, so a crayon drawing seems like a bigger deal than it really is.