"I see YOU!"
Very interesting idea. Great magnification ratio. Excellent composition but it is more important how to improve this type of shooting.
I think you already have known it. However, I repeat some key moments. Aperture value (f/2.8) is too large. It is not necessary to aspire to the minimal distance of shooting. At minimal distance DOF is very shallow despite even small aperture values. This mistake I have admitted yesterday, photographing the microscopic flower, one of that I photographed in autumn and did it very successfully. Yesterday I did not manage any good macro shot. It is better then to use crop. What has happened with background (its colours) I do not know.
My best wishes and TFS.