Talking about Shaft

Is it bad etiquette to give concrit on icons?

You know, like: Love the effects! But mmmaybe you should look into that sharpening thing? Or: Adore the colouring! But perhaps you should try not to sharpen quite that much? Or: Ohhh, I like these, especially the cropping, but you might wanna get familiar with the anti-alias thingy?

Because I don't think I've ever seen a comment like that.