I actually enjoy having my online sub have to describe to me what he is doing with words. I suppose verbal communication is easier for some than for others, but when you get down into having to describe the details yourself with words, it makes you have to think about it and say it and admit it, and that alone can have nice psychological effects.

For example, if you said your kitchen was messy I'd simply respond with "What does 'messy' mean?" Then you have to think about it and describe the objects in the room yourself, which can get your mental juices flowing.

However, if you were wanting to move from an online relationship to a real one, or if you've already known the person in real-life and now you're far away and are using the internet to keep in touch, then I think pictures are an excellent idea; I suppose they are kind of like a step between "internet" and "real". Just always keep in mind that anything you put up on the internet could potentially be seen by someone else.