Not representative or symbolic; not iconic.
Determined by independent arbiter.
Determined by impulse rather than reason; heavy-handed.
Based on individual discretion or judgment; not based on any objective distinction, perhaps even made at random.
Any, out of all that are possible.
Anything arbitrary, such as an arithmetical value or a fee.
Pretentiously artistic; self-important or self-indulgent, especially when describing an artistic project.
Someone who is arty-farty.