On the Skype Blog the developer team have announce that photo sharing is coming to the Windows Phone and Windows 8.1 version of the app. It is a feature you may have expected to already be in the app but it wasn’t and now it is.
In version 2.21 of Skype for Windows Phone 8.1 and Windows Phone 8 you can send a photo to a contact running the new versions of the app and the latest version of the iPhone Skype client. You can also share with other client versions of Skype the contact will get a link to the photo.
Also in the update you can see more of your conversation history, use text markup eg *bold* and add to favourites from the chat view. Plus there are performance improvements.