Fashion Illustration: black and gold ball gown

My inspiration can be found here. Please pardon my less than white paper. Scanning it doesn't do the dress justice and taking photos of this piece is quite challenging. I assure you that the actual paper is white.

This was my initial sketch. 

This was my first addition of paint and skin tone. The paint is lamp black and raw umber. The skintone was achieved with a caramel shade of ink. 

I have accented this dress with QOR metallic gold paint by Golden. It is absolutely amazing. 

Skirt detail.