Released today to celebrate the movie, Thor: Dark World coming out
Quality in the preview not actual representative due to converting into gif format to show them off in bulk. In the file you will have both png and indexed pcx image files for each and every portrait.
Download: http://www.mediafire.com/download/eqmivb44pyqxt4z/Thor_Portrait_Pack.rar
If you need help on how to change a main port, read: http://mugenmultiverse.fanbb.net/t506-changing-a-main-portrait