And thanks! I always try to find a nice expression (either funny or cute) of the character I pick for my avatar, and I thought this one captured a side of Twilight's personality quite well!
Yeah, that's what I usually aim for as well. There's a particular cute picture of Twilight that I've screen capped, but I jut need to figure how to properly crop it first.
I usually start using an image right after I find one I like. My next avatar will most likely be of Applejack (the only Mane 6 pony I haven't had on my avatar yet)... and I have no idea what image to use yet!