you'll have to define "friendship" in an online basis, and what do YOU expect from this online "friendship". visual image of a friend is important. however, is it important for online "friendships"? maybe yes. maybe no. perhaps, you are expecting more. in that case, you should express that expectation rather than make assumptions about a person's confidence or character. If visual image is important, would this also be a superficial or physical aspect that you are seeking in friendships? and, are these the right reasons to base an online friendship?
Furthermore, you seem to value privacy. Perhaps, if a person wants to remain faceless, respecting that person's decision would be a good sign of friendship. Or else, if you ask kindly, that person's face may just appear. hint hint ;)
In addition, maybe, ask why that person decided to be faceless. you seem to be a relatively new GAG user. so, there may be a lack of experience and understanding about this environment. Similar to Kangaru (the user below), I also had my pictures up. However, after an unfortunate incident, I decided to remove them. GAG users seek answers that they already know. They ignore or criticize answers that differ from their own. So, why ask or answer? just to speak out and seek others that confirm their ideals. all other questions/answers can be googled (thanks Google!). Furthermore, a part of being in a virtual environment is to escape reality. For me, I used to take things more seriously on here; however, after my incident, I decided that it is less stressful and more fun to just goof around and meet people to discuss real issues offline (...for REAL friendships). why stress yourself over other people's problems who you don't care about or who doesn't care about you, right? if you can help, great! I am all for it. but, I recommend that you do not put too much into others' issues or you will be disappointed in the end. just my suggestion from my GAG experience.
anyways, hope that this helps. have fun! happy holidays! :D