First study had "mixed results," second is about a healthy level of musculature (ie the preference was for men without dangerous levels of atrophy), third says that too much muscle was as unattractive as too little and again all three focus only on upper body attractiveness which is clearly distinct from overall attractiveness, and again suffer from similar sampling/methodology issues as your first study. The fourth is based on references to the others and self reported sense of attractiveness in men.