Full leg tattoo sketch, black and grey realism style…

Full leg tattoo sketch, black and grey realism style, Yggdrasil world tree concept. Upper thigh: tree crown dissolving into cosmic space, nebula clouds, scattered stars, branches transforming into starlight. Knee area: thick detailed tree trunk with bark texture, wood knots, runic symbols (Vegvisir compass in center, Tiwaz, Algiz runes). Lower leg and shin: massive gnarled roots spreading downward into dark earth, moss, stones, small runes carved into roots. Three realms concept: Asgard (stars/cosmos) at top, Midgard (trunk/earth) in middle, Helheim (deep roots) at bottom. Style: fine line blackwork with grey wash shading, no color, tattoo flash art aesthetic, high detail, no aggressive imagery, spiritual and aesthetic. White background, full leg reference sheet.