I leave you to your deductions

Irene Adler: "Do you know the big problem with a disguise, Mr. Holmes? However hard you try, it's always a self-portrait."

Thought it would be a good idea to draw this funny scene but it was harder than I expected. Something is totally wrong in this drawing but I can't see what it is -.-

Date : 22.09.2013
Used : 5H, F, B, 5B, mechanical pencils (0,3&0,5mm), uni pin fine line pen (0,2&0,5mm), gel ink pen, blending sticks, A4 paper
Time : 5h 59min