The titles of each piece are as follows, from left to right, top to bottom:
First Row: 1) Demoness; 2) Princess of Darkness; 3) Blonde Devil Girl; 4) Cthulhu
Second Row: 5) The Vampiress; 6) Blonde Vamp; 7) Asmodeus; 8) Burning Desire
Third Row: 9) Dragon Lady; 10) Biomech; 11) Demonlove; 12) Groovy Witch
Fourth Row: 13) Hellish Dream; 14) Witch; 15) Naga; 16) Serpentina
Fifth Row: 17) The Real Red Riding Hood; 18) Pan
Gallery