Tried to post to avian forum and got this message:

female-card-head-shot-bpn.jpg - The Dimension limits for this filetype are 1200 x 900. We were unable to resize your file so you will need to do so manually and upload it again. Your file is currently 858 x 1200.

858 s less than 900, so I'm not sure why it is rejected. it's a vertical shot, is that the problem?