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However I like simple and minimalistic style designs. So good job. The only thing that is not great out of all the posted image examples of your logo in practical use is the 3rd and last image.
The 3rd image I take is a flyer and the last is the website for the business owner, I would make the flyer more colourful in better in touch with the business card theme and the website could be less all over the place, and still bring across that artistic feel well.

Thanks Oliver! The third image is a bio sheet (kind of her artists resume of sorts) so it needs to be able to be easily printed in black & white as well as photocopied well. That's why I wanted to maintain as much simplicity there as possible.
I'll definitely do a bit more tweaking to the website and bring things in a bit tighter. She really likes the scattered feel of it but I agree that it could be a bit tighter.