You cannot remove a contact picture once it has been set.

Assigning a picture to a contact is an easy task in Phone 7. You chose the contact, enter edit mode and tap on the empty picture space. The pictures hub will then open and allow you to select a picture, crop it to the desired picture part and finally save the picture under the edited contact.

This is all fine but Phone 7 proves stubborn when you later wish to remove a picture from a contact. Note that I'm talking about a deletion of the contact picture from the contact, not the replacement of a picture by another one. So how do you do it?

You can't. There is no way to remove a picture from a contact entry once it has been set. No long-tap, no context menu, no trash symbol. It's as simple as that: you can't.

The only way to liberate a contact from an unfavorable picture therefore is to create an Exchange account, sync your Phone 7 with it, remove the contact picture in Outlook or any other Exchange enabled software, and wait for the next sync of your Windows Phone 7.

Come on, Microsoft, how hard could it be to add this feature to a context menu.