Almost all printable wall art mistakes come down to the same cause: something between the file and the paper changed the file. It got scaled, stretched, resampled, or sent to a driver still configured for a text document. The design was fine. The handling was not....
If you want to know how to print wall art at home and have it look like something you bought framed, three things decide the outcome: paper weight of 200 gsm or heavier, a borderless or margin-matched print setting that never scales the file, and a print dialog set to...