African Etnic Watercolor

I like this style, especially the bamboo frame I found in a shop. Women are original, I mean, I didn't copy them from any picture, but the style is well known.

I thought to make this picture after a documentary I've seen on Internet, I've searched on ebay something like that and I did not find what I was looking for.. so I did it by myself and I'm actually selling it on ebay.
I do't know which paper and what could I do to improve it, I would like to see examples of this made in watercolor.