This is wonderful! I think the light is so appropriate, the composition is treated with imagination and creative attention. Hair graphically touching, profile shadow reflected on back, face leaning in front and placed in the so called emotional human centre outside of the body, cropped lips... and a fine grainy picture... I think all contribute to this great result. (My only doubt would be about the emphasised eyelasses, but still not critical)
I love the feeling of togetherness this photo has. Good lighting and use of emotion to draw the viewer to this photo. Very soft feeling, like love is supposed to be. Awesome.