First, let me say that I agree that you are very creative and artistic, as shown with your drawing for the logo idea not long ago. That being said, as far as your tattoo goes, I would recommend coming up with some ideas of what you want, and even doing a drawing for the tattoo artist to reference. I would however recommend that you give the artist the freedom to redraw and revamp whatever idea and drawing you come up with that represents what you want. The reason I say this is because a professional tattoo artist will know what images translate well onto skin and what images will stand the test of time. Working with ink and skin is a completely different beast than working with paper and pencils, charcoal, etc. For example, images with too much fine detail will tend to blur and distort on skin over time as the tattoo ages and settles. A good artist will be able to take your idea and image and make it into something that suits the application as a tattoo...

As for ideas, I also echo what was said before. If there is something that was special to your mom or something that reminds you of her every time you see it, try to incorporate that into your idea. It will mean much more to you than having someone on an internet forum suggesting something to represent your mother to YOU. Good luck with whatever you decide, and don't forget to post pics when you get it done...