If the artist asks for critiques, then critiques is what they'll get, even if they come off as "rude" to some. Have you been in an art class? This is how critiques work, so complaining about someone being "rude" is really unnecessary. That's why art is so subjective.
Anyways, I agree that Felicity is a bit hard to distinguish. Her nose area seems to protrude too much for a cat. Also, the rat seems to kind of blend in with the background since they're sort of alike in color. Maybe make one or the other darker so they don't become one.
I think you're doing well, however. Keep on practicing. I like that you used dark lines on one piece and the others are not dependent on any line art.