Alright, time for some updates. I see I did something stupid, and I apologize. I see now that I was kind of being a prick. I regret what I did, and I would apologize to the deviant, if they had not blocked me. I'm closing the thread ASAP.
Telling them they need to improve is nice and all, but it's really unhelpful if you don't elaborate on what they need to improve on and ways they can do so. Considering you didn't seem to say anything else to them within that comment (that I am aware of, anyway), it really only sounds like a sugar-coated "Your art sucks."