Should the studio give the negatives to the customers?

I can't give you a negative for the excess. Although the right to portrait is yours, without your publicity, others will not infringe your right to portrait. Copyright belongs to others, but you can ask them to delete it for you without spending money. Legally speaking, it is reasonable to take more photos of you. People also spent a lot of money, such as time cost, late color matching cost, hardware and clothing depreciation rent, and it is also appropriate to charge more money. From a commercial point of view, it is also in line with the law.