This is a fun subject but the lighting is very drab. A high key white background would work better to make the colors sing. To do that, simply set your EV mode to a + setting and it will overexpose the white background, reducing the shadow that makes it appear grey. Try a few + stops up until you achieve a good balance--you don't want to overexpose the beads in the process. The grey background drabs down the colors of the beads. Also, try to create a seamless background to avoid the line bisecting the frame. For a subject this small, a piece of white paper taped to a vertical surface with a portion of it resting on the table works fine.