detailed comic-book art of an old grumpy gremlin, ai-generated

elderly gremlin disgruntled illustration scowl grump frown furrowed frowning wrinkled cross displeased sullen sour vexed gloomy cynical morose haggard grumbling grouchy scowling dour crabby cantankerous glum grim pout begrudge grudging acid scolding grousing grumpiness ai generative digital art