John Lennon

The photo reference you used and this drawing are practically identical.
You look at it once then have to look again to make sure it isn't the photograph.
You did an amazing job of pushing your lights and darks and creating an impacting piece of art.
I usually stray from writing on my artwork and dislike it when others do but you did it very professionally and tastefully.
the background does not take from the main focus of the artwork.
The detail in his clothes also adds to the realistic quality of the drawing.
John's face is very hard (as far as I have found in my attempts to draw him) to get proportionate because of his unique characteristics.