These were taken indoors with no artificial light on an overcast day. ISO was 1600.
The third photo looked just a little washed out. Picasa to the rescue! I brightened the white, added a little shadowing, highlight and fill light. I liked the result.
Now it's on to the final lessons on Black and White, Portraits, and Creative Tips.
Heads up, Lucy ~ I do think you are due for a canine photo portrait.