Highly detailed vintage retro vinyl sticker illustration of an anxious tabby cat sitting upright facing forward, wide darting nervous eyes with visible pupils, dark eye bags, slight twitchy whiskers, tense ears pulled back, gripping a steaming espresso cup with both front paws. Intricate fur rendering with fine parallel hatching, cross-hatching for shadows, dense linework on chest fluff, individual whisker strands, subtle expression lines around the mouth. Steam wisps curling from the cup with elegant flowing lines. Bold curved arched text "RUNNING ON" above the cat following a half-circle path and "ANXIETY & CAFFEINE" curving below in a matching half-circle, in bold condensed slab serif font. White background, professional black ink illustration, vintage engraving aesthetic, no border, no frame, isolated illustration centered composition.