For me, personally, I think it'd be easier to say who you look like more if you gave us photos of both. But, since you asked specifically about your mom, then no, I don't think you look a lot like her in that photo. But then people can look drastically different depending on the angle. Depth is tricky to discern in a photo sometimes - especially in a flash photo. Flashes tend to flatten everything.
Did that make sense?