Not being able to leverage digital images to their fullest when communicating with new media technologies is like writing on a typewriter rather than on a up-to-date word processor.
But not many people are aware of the fact that you do not need expensive, difficult to learn and highly technical software to do this type of work. Great alternative and very cost-effective software tools have been available since a few years, and now they are only increasing number and quality.
Here a few valuable pointers:
Free digital image editing tools
Unless you are strongly opposed to Microsoft .NET framework-based application, Paint.NET is a very interesting free and fully-featured digital image editor that I recommend to all Windows users.