I am sure that there are some guys here who are pretty good at Photoshop or similar. All I would like done is the following image converted into 2 colours (black and white). This image will hopefully be printed on to a T-Shirt (like a kind of El Che parody). I had a go myself, but I would like to see a better image in PNG format so the person in the original image is most recognizable. Thanks.

(Click for the larger copy of the image)
Here is my attempt (a little too bright, perhaps?)

T-Shirt:
