Wendy has given some great advice for finding answers to questions regarding the site.
The eye symbol does mean that someone is online. If you send someone a message or a chat request, they may technically be logged in, but away from their computer, or they may have forgotten to logout completely. The site does not have a way of knowing if someone is actually facing their computer screen at any given moment.
I'm not sure I understand what you mean by #3. CM members are allowed to set up a profile without pictures. When I first joined the site, I was a bit uncomfortable with online dating, and didn't have any pictures either. If you read a profile that does not have pictures but you are interested in what they have written, you may wish to send them an emotigram. It may get that person out of their shell a little bit, and a bit more comfortable with the site.