If you want to nail the flamboyant, sculptural look of 'JoJo's Bizarre Adventure', start by collecting photos that exaggerate anatomy, poses, and fashion. Look for high-contrast photos of bodybuilders, wrestlers, and dancers — those images give you the bulging muscles and dramatic weight-shifts Araki plays with. Also grab runway/editorial shots from fashion magazines: long limbs, odd hand placements, and unusual clothing folds translate straight into the extravagant silhouettes you see in the series.
I also swear by classical sculpture photos — think Michelangelo or baroque statues — because they teach you how muscles and drapery behave in three dimensions under harsh lighting. For faces, save close-ups of actors with strong cheekbones and dramatic expressions, and for hands specifically, collect glove/hand-study photos; hands in 'JoJo' are a whole language. Don’t forget foreshortening: search sports action shots (basketball layups, sprinters) and superhero promo art for extreme perspective practice.
On the practical side, take your own reference photos. Use a phone, a friend, a mirror, or a tripod and timer to pose in dramatic three-quarter stances, exaggerated contrapposto, or mid-action snaps. Try rim lighting and strong side light to get that sculpted, comic-book feel. Finally, study panels from 'JoJo's Bizarre Adventure' itself not to copy but to see how Araki simplifies, distorts, and stylizes real anatomy and clothing. I mix all these sources when sketching — it’s messy, loud, and rewarding, and you’ll find your own visual vocabulary faster that way.