I know most of the time that people don't say it meaning to be an insult but it still comes off as one. It doesn't bother /some/ artists but it bothers /most/, especially when it becomes repetitive. Every rabbit drawing I make I usually get some kind of "it reminds me of watership down." and it really burns my beans. It usually makes the artist feel like they're not original, maybe that you're accusing them of theft, or their artwork left no impression on you whatsoever that it just makes you think of something else. It's never a good idea to say it so please don't.
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