//make a photo required during signup
if (Ka.Info.PAGE == "login/registerUser.jsp"){
$j('#photoPortrait')
    .attr('required','required')
    .attr('errorKey','photoRequired');

Ka.formValidation.messages.photoRequired = 'A picture is required.';
}

Just add this in script tags in your Affiliate Center footer:

--<br>
For more tips and tricks checkout the <a href="http://www.kickdeveloper.com/resources">KickApps resources page</a>.

KickApps: Make a photo required during signup

JavaScript