Avatars/Expression images

Hi all,

1).Im wondering if anyone can share resources to purchase images of people with various expressions and poses.Any free resources are also welcome.

2).I will also like to experiment on talking avatars to insert into my presenter course.

3).Lastly, can anyone share any backgrounds I can use to design courses and import  into presenter?

Most of our courses have the basic powerpoint backgrounds and i would like to try something different that can work with an avatar.Also, backgrounds with projector whiteboard screens that i can use.

Any ideas/thoughts are welcome.

Thanks

Maurine x