>>4951755There is no diffrence. It's entirely subjective.
You can argue that illustration = higher fidelity, cleaner, more polished, etc, but that's all relative because one project's concept art is another project's final promo art. Or sometime the concept art literally becomes the promo art. Or sometimes just straight up appears in game.
Riot has hired concept artists who've handed them higher quality images than this, so really 'Concept art' tells you very little about an image beyond than the stage in the project's development at which it was produced.
