Hi!
Meaningful projects like these are a dream come true for a true artist. It'd be a pleasure to provide you with a detailed sketch of your grandma, it's honestly the best possible gift you can give to your mother. My older brother is a genuine master of this art, and together we've supplied sketches and paintings to numerous online clients. I assure you, each detail of her face would be drawn with the nobility of this project in mind. I'm ready to talk to you more about this, to find out what exactly you're picturing the final sketch to look like. I'm sure we'll exceed your expectations. Thanks!
Regards,
WordsAlchemy