Your contact might have blocked you, perhaps by mistake.
2. WhatsApp profile pictures of some specific contacts not showing.
3. Your contact might not have uploaded a profile picture.
4. Your contact's privacy settings for profile pictures may be set to "Nobody".
5. Your contact may not have saved your number in their contacts list.
6. Your contact may not have given the right app permissions.
7. There may be caching errors in your and/or your contact's phone.
8. There may be issues with network connectivity.