Yeah, I like them. Not sure what they're from, though. As you can see, there's what appears to be an entire page from a comic book. I don't know if he actually drew a
Star Wars comic, if it was a proposed project that never went through, or just something from among his various sketches showing his style applied to different properties.
They're in the book
Modern Masters, Volume 3, an issue that is a must-have for any Bruce Timm fan. The entire book is basically one long interview that covers his entire career, from his early life all the way up to about the end of
Justice League, and the final section is a portfolio with a variety of artwork. I love it.