I have WhatsApp installed on my HTC Sensation running Android 2.3.4 (Gingerbread). I also have other social contact related apps such as Google Voice, Facebook, LinkedIn, Twitter, etc. For my Google Contacts, it links each of these services up to the people in my address book.
When using WhatsApp, only a few of my contact's icons shows up for the screen with recent messages. When I view the contact in my address book, they have an icon (headshot) either from Google contacts, Facebook, or some other social service.
Why do only some of my WhatsApp contacts have icons showing? The other WhatsApp contacts default to an Android avatar. I've refreshed the WhatsApp contacts list and the problem still persists.