You should be able to say to your mum that you're grateful for her advice and for paying for the highlights too, but what you really want is darker hair for your pictures. You shouldn't have to do it on the sneak... Your mum should respect your opinion on how you want your hair to look.
Try telling her that you appreciate her opinion and paying for the coloring, but you really want your hair dark for the pictures. You want to be able to look back on the pictures and for them to look how you wanted, not what your mum forced or guilt tripped you into having! lol
Well I think you should have your hair how you want it for your pictures. They will be something you and your family look back on one day though so just make sure its what you really want. This depends on the individual and the relationship you have with your mom too. Personally because of the way my mom is, its so pointless to argue with her and deal with her when she's upset. I'd just get highlights for the pictures and dye it later lol. So just do what you want and like other answers said deal with any consequences if there are any.
Well, I agree you should be able to do whatever you want with your hair. But you know, if you change your hair your mother may not buy you the pictures anymore... Talk you your mom. Tell her why you want your hair that way. Let her know you are grateful for her help, and that she is doing this for her. But in the end it is YOUR picture and your life. You want to remember it a certain way. You appreciate her opinion, what she's doing but you don't want these pictures if your going to regret them. They are life long, and her putting her foot down over something your going to do anyway is silly. Talking things over calmly, and letting each other know how you feel is always the best answer. Emotions are always in the way, but logic is the basis of life.
Well it's a picture so it's kinda permanent and having this in mind your mum probably told you to get highlights for this reason, perhaps you look best with highlights so she wants that in the picture?
I'd listen to her because in those situations, mums are usually right.
Lol ya that's like when my mom told me not to dye mine but I did it anyways but tried to do highlights so she wouldn't notice but once I did she wasn't as mad.well once its done there's nothing you can do.But maybe you could darken your hair and get highlights in a lighter brown?