Very nice work on combining all of your source images. The purple eye-shadow is just to die for I think you need to play about with the direction of your light sources though. The left side of her face could use a slight gradient overlay so that it is not as bright and is more in keeping with the left shoulder area in comparison to the brightness of the right shoulder. The left leg is the difficult one. Do you brighten the upper part of the leg to match the light source on the boot and the hind quarter of the cow. or do you darken the boot and hind quarter of the cow to match the shadow of the upper leg.
im self taught so i think i do it differently .. i use the inner shadow and grab a color to match,or i mask an area and adjust.i did see her face popping out ,but thought id dim it to much and it wouldn't have an impact ,ill try gradient tool next time thanks.