I like this. With a heart on her lips you would think this would be a fun image but her eyes and the lighting make you wonder. A good portrait that makes you think.
looking at you pictre, I get some mixed feelings. your title and the heart convey a warm loving emotion while your model's expression seems to be rather cool. There is abolsutely nothing wrong with the technical aspects of your shot.
Technically a strong image, good lighting. For me somehow and I can't define it, the placement of the subject in the image doesn't feel right. I don't have problems with cropped heads, but somehow this doesn't work for me. Maybe an angle on the face or a vertical image would have appealed to me more.
The portrait itself is quite nice. The heart ruins it for me, but I'm not sure what to suggest would have made it better. Maybe a lighter colored lipstick?