I like the ship design. Even if one couldn't tell it was fake looking at the image his writing telegraphs too hard for the ion drive angle with out ever using the word.

your characterization of graffiti artists smacks of classism. And calling them "supposed" artists underlines your lack of understanding of the nature of art itself. Legality and skill level have nothing to do with status as art. For that classification only intention and function matter. If you must remain steadfast in your distaste for the work or the form in general you would be well served to express it without lowering yourself to bigot or fool.