- Older phones and SIM card based phone books generally have multiple entries for one individual for work phone, home phone etc. You should go through and collapse all the entries for one individual into a single entry.
- The is best done using gmail''s contact option rather than on phone
- Go through all the addresses that you use with gtalk i.e. people with whom you chat, make sure these addresses are part of your google contacts. Once you do this, if these users have put photos in their gmail settings, you will see these as picture ids in your contact book.
I have to say, once you do all these, the phonebook in android phone becomes much better than anything else that I have seen on phone. The best part is that I don't have to manage people's picture ids and they can change their own picture ids.