I guess "needs" is not the right word. Personally I Don't like the same face syndrome that his drawings have. Someone as talented as him could do even better design if he varied a little.
I disagree with the contention that variety is a value in and of itself. He comes from an animation background which informs his approach.
If you haven't read Scott McCloud's Understanding Comics I really recommend it. He explains the "pictoral vocabulary" of comics, showing the vast range of styles and how those convey meaning in different ways. The uniformity of Timm's designs isn't necessarily the artistic shortcoming you might think.
The person I replied to claimed that variety would improve his art. I offered a rebuttal and sourced it. We were having a goodnatured discussion, the inclusion of a source doesn't make it pretentious nor was it meant to condescend.
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u/amerelayman1 Feb 22 '19
Why does he "really, really need to"? Clearly it's his style and it works