For more precise creations, use the following trigger words:
portgas d. ace, black hair (medium messy hair), black eyes
For a complete character look, use the following trigger words as well:
single arm tattoo, topless male, shorts with a belt, orange cowboy hat with two blue smiley and frowny faces, necklace of orange-red beads, dagger at his side, single elbow pad, bracelet, beads