I've uploaded a photo to a colleague's account. When I log in to her account I can see her profile picture. However, when I search IMDb for her profile, there is no picture visible. I uploaded almost two weeks ago - what could be this issue here?
The only way to upload a picture to a person's Name page is via the Resume Subscription.
It sounds like you have added the picture to her User account, which is the account used to access IMDb features. This picture will show up when she posts a message to the IMDb message boards, but has no connection to her name page.