"Professional looking" is a moving window, has been for a long time.

Right now, looking like an AI did it (even if it was actually a human) is a sign of being un-professional. To a limited degree, one can prompt an AI better and get something that doesn't look as cliché as the default settings, but even then there's often someone who can spot a tell. "You can fool all of the people some of the time, some of the people all of the time, but not all of the people all of the time" applies here.

Art is at least two different things, for at least two different groups: nice to look at etc. is one of them; the human equivalent of a peacock's tail (i.e. the effort is the point and cheating is worse than having nothing) is the other.