For some reason, "IMG" tags have not been working for various people, recently. I used HTML to do this (img src=). I also left height and width specifications and set them to half the image's size. Please leave those specifications in there, as many users get annoyed by huge images in signatures. The current size is perfect.

Also, I am not getting any red X from your image. it appears to display perfectly. Try right-clicking on the absent image and selecting "show picture" to reload the image on the page.