@Kingston, I agree with what you're saying. I would only sign and claim a painting/drawing as my own if it's genuinely original (i.e not copied from someone else's photo). Photography is also a hobby of mine, and I enjoy capturing images with the thought of turning them into paintings later on if they're good enough.
I'd like to see some truly original work from this artist, Heather. I was kind of just thinking out loud about copyright issues, and that it could possibly catch up with her, especially if her pieces start selling for a lot of money.