I started with the original Thor poster. I then took a self portrait in a similar pose and tried to get the same shadows to save some time in Photoshop.
I had to remove the original text in the poster, then apply my portrait and mask out everything but my face. The eyes were made blue. I had to widen my face a little bit (I didn´t realize my face was that narrow). Finally I had to write in the text back in, using the same Times New Roman font.
The colors in my face and eyes were created with Adjustment Layers.