I have been taking photographs of some friends' artwork (as a favor), and they use these photos for show submissions, portfolios, and the like. I have received some very positive feedback on my work, and I am considering trying to make his into a part-time business. I have no idea what to charge. I specialize in 3-D artwork, ceramics, sculpture, jewelry, and the like. I do not have the lighting equipment required for good photos of paintings and drawings. And advice will be much appreciated.