too few magical girl images with complete clothes, so the tag is much longer
add "curvy" after transformed as she becomes more curvy, "wide ponytail" / "tied hair" might help for the hair style
Magical Girl : tenshuura,blue eyes,blue hair,long hair,large breasts,curvy,magical girl,hairbow,detached collar,blue bowtie,blue heart brooch,yellow chest bow,blue frilled dress,blue top,dark blue corset,navel,blue miniskirt,white back bow,white elbow gloves,knee boots,
Tenshu Ura : tenshuura,school uniform,black hair,short hair,large breasts, (maybe "medium breasts"?)
School Uniform : serafuku,pleated skirt,green skirt,kneehighs,loafers,