Thanks for the entry! However, it's not one I like, I'm sorry. I think that's partly because it feels 'static', and partly because the icon in the speech bubble looks at a glance like a sad face :( not a person.
Brighter colours might help, or perhaps a change to a more 'active' design.
Most of the comment about #8 above would apply to #9 with the additional comment that #9 is a bit too 'simple'. The combination of the font and icon are not sophisticated enough. I also wouldn't want the idea that the speaker is "above" the audience.
Thanks for the new entries. #13 is the best of yours now, but I still prefer some of the others. I think the colour still makes it look too cold. Perhaps two colours, some shading, or a different colour might help.