Ahhh.
If you make the assumption that the universe works pretty much the way we think it does, then it is a decades-long one-way trip from the nearest star to here. If you further make the assumption that an alien civilization exists some random distance from us then it is a centuries-long one-way trip.
I think we are just wonderful, and everyone in the galaxy should get to know us. But it will be a major commitment for visitors to get here. They would have to put all the wealth of their civilization into making it happen.
And assuming they did that, would they really draw pictures in the fields?