No illustrator is credited on the publisher's page or any retailer listing checked. The deck prints its interpretive text directly on the back of each card rather than in a separate guidebook, so creator Denise Jarvie may be the sole author of both image and text, but that could not be verified to certainty.
What would resolve this The deck's own packaging or a publisher catalogue record, examined directly, stating whether the imagery is Jarvie's own work or a separate illustrator's.
OpenPublishing historyDenise Jarvie, The Flower of Life, Wisdom of Astar Oracle Deck (Amazon listing)