[Tony G]

Okay, here's how to do it.

When creating the new field, make sure you don't allow it to be edited in the User CP (Edit profile) and hide it from users.

Now, take note of the field number of the newly created profile field.

Now open postbit/postbit_legacy (whatever your setting is) and add where you want it:

<if condition="$post['fieldX']"><img src="$post[fieldX]" alt="" /></if>

Now, replace X with the field number of your newly created field. Next, go into the profile and where you see the field for your new profile field, add the URL of the image. Should work. Not tested.

(You can also do this with stylevars to make your life easier, so if you want that, just reply saying so)