I can't do tutorials for the life of me but I will tell you what I did and you can ask questions. I don't have the original image from the joindumbledoresarmy.com since I forgot my password but I took the image of Harry that was in color and most likely did the following:
1. I cropped to 100 x 100 2. duplicate base 3. top layer --> soft light (until I thought it was contrasted enough) 4. merge layers 5. duplicate base 6. top layer --> sharpen (until I thought it was sharp enough) 7. merge layers 8. add new layer 9. fill it with black 10. set that to hue (L) or saturation [whichever one you like better) 11. merge 12. add text (I used fonts from Dafont.com)
no subject
1. I cropped to 100 x 100
2. duplicate base
3. top layer --> soft light (until I thought it was contrasted enough)
4. merge layers
5. duplicate base
6. top layer --> sharpen (until I thought it was sharp enough)
7. merge layers
8. add new layer
9. fill it with black
10. set that to hue (L) or saturation [whichever one you like better)
11. merge
12. add text (I used fonts from Dafont.com)
does that help?