Obviously there are a lot of color's (well different shades of blue) here in this image and I don't believe that beads come in that many shades of blue so to get around this I suggest making Stitch using different color beads like pink or purple and labeling what color they reall are so you don't forget and then when your done paint over it. It's what I do when I'm low on beads or I'm trying to preserve a bead color for another project.