Adding external images to these reports is a bit fiddly. The "handling images" section of this devx article sheds some useful light on what the path must look like, and how to handle relative paths.
As local reports require an absolute path, one means of doing this to use an embedded VB.NET function:
Public Function GetAppPath() As String
Using this function, here's how you can set up the Value property of an image to point to the external image file.