i have to repeat what everyone is saying, but you drew an INCREDIBLE-drawing of david bowie, and the details are so amazing, that it just looks like a real-life photo of him!
its almost scary to look at this drawing for too long, thats how realistic it is!
it looks like a photo.
first of all, you've drawn his eyes PERFECTLY.
the eyes are very nicely drawn, they are accurate, the shining of the eyes, the ''teary, liquid-state of the eyes'', is drawn in a realistic way, the way his eyes look towards the viewer, and the pupils/irises in his eyes are truly drawn accurately, and in great detail, making this drawing a very realistic, almost-haunting artwork. (yes...).
other than that, you did a GREAT job in the shading/lighting effects on his face, the way you drew his eyebrows, his nose, his mouth, his hair, and his skin is truly incredible and very, VERY realistic.
i mean, his skin looks like real skin, and i can even see the pores/the stubble on his skin.
other than that, this drawing is a nice, peaceful and emotional tribute to the great person and artist, david bowie, and i wish for him to rest in peace, he left earth too soon.
(and thats a sad thing, for every person that leaves this planet too soon)
you did a great drawing, and you are a good artist.
keep creating epic art.