If you are adding images to biography text boxes, please do include the label parameter for those using screen readers.
On those profiles I linked up there ^^ you can see on mouseover "floating" text with a (hopefully helpful) description of the image. The importance of alt text (aka the label parameter on the image code) was highlighted only a day or so ago by one of our blind members.
Another point is - an image needs to be on a public profile, or it cannot be viewed, showing as either white-space or an error, in the biography.