Changing character images

Hello

I have used the character and text box slide a few times in an emodule and it gives me the same default character of a woman everytime.  When i try and select a different character, I only ever have options of real looking people as opposed to a library of similar illustrated versions.  I like the default one it provides, but there doesn't appear to be ay options for having a similar style of illustrated character.

Does anyone know if there are more options available?

Thanks

Sarah