When you do not want to post your foto?

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It's just the default avatar, and it's meant to be gender neutral. Avatars like that are quite universal. Facebook has the same thing. I guess Yahoo couldn't be bothered to make a female looking one.

As for Yahoo! Avatars, it was discontinued on April 1, 2013. Unless you already have one saved to your computer, you cannot make any new ones or edit any current ones. Read more here:
http://web.archive.org/web/2013070408402...id=SLN8404 This is a snapshot of a Yahoo Help Page, but it is somewhat out of date. There are no working links.

A common alternative to Y! Avatars that many Yahoo! Answers users is this avatar maker: http://laughingsquid.com/faceyourmanga-c...om-avatar/

By the way, you're not obligated to use your real photo. If you want to use a photo off the Internet, see here:
Adding or personalizing your profile image - http://help.yahoo.com/kb/index?locale=en...id=SLN3609