Yes! You can add author photos to the Press Kit section of the NetGalley title record.
Simply click the orange arrow next to Edit Title Details and scroll down to the NetGalley Extras section of the page. The Press Kit section is at the bottom.
From here you can browse your computer to find and upload files to this section, and also add a text description of the file (e.g, Press Release, Exclusive Interview with author, etc.).
The following file types may be uploaded: .PDF .JPG .JPEG .GIF and .PNG. The maximum file size allowed is 1 MB.