Often, IME, there's more criticisms of a thing, than praises of a thing.
Personally, I find it easier to describe the flaws of a thing, than it's advantages (“Looks good” is only 2 words…).
When you are shown a drawing and you answer "that's nice", it shows a lack of attention to what you were provided.
For proving you actually cared and analysed it, you need to provide "constructive criticism" which is often something like : "I like it but I think you could improve it by modifying this specific area."
@ebel It could also be "I like it, and I'm really impressed by the way you married the colors of the background with the clothes of the foreground character" but people are rather negative in their critics (which join your initial comment: it's easier to criticize than praise!).
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