You're engineering with an artform that's why you see so much variation among the patterns.
Every portrait might be recognizable as a portrait, but every portrait is unique in its details.
"the expression or application of human creative skill and imagination, typically in a visual form such as painting or sculpture, producing works to be appreciated primarily for their beauty or emotional power."
Software developers have a tendency to try to claim artist status because what they do is almost entirely meaningless and a waste of time. The exchange of time for money is too transparent so they are unfulfilled and try to imbue their work with meaning. If you want to make art, do it, it can be a hobby. Yet another useless website created to shove more ads in people's faces is not art.
> 2. (countable) Skillful creative activity, usually with an aesthetic focus.
> She's mastered the art of programming.
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> 7. (countable) Skill that is attained by study, practice, or observation.
If that doesn't convince you, compare with such phrases as "The Art of War", "artisan bread", or "liberal arts" (which includes topics like philosophy).