I love your mum :P! A very good rule! I think it looks good on you, but if it is the helmet itself that you don't like, there is others on the market. The cowboy-style witch looks at a hat, or the dressage one, also as a hat (I think), or the plane black, brown or blue ones. It's good to know you use a helmet anyways.
And what a beatiful horse, love it