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 tattoo idea - made by Ink Studio AI