My 3rd mini painted after 30yrs away from the hobby.

Hello all, as the title says I've returned to painting after 30 years. I'd love to have some honest feedback and welcome constructive criticism. I'm not happy with the shoulder's, and the highlights don't feel right. I'm working with a limited amount of choice with paints at the moment but have some on order. Is there any paints you could recommend that are essential for BT please? Any YouTube tutorials you'd recommend. Thanks in advance.