This is a sample of how using layers to add a background can leave traces on the top one, at least for me not sure of any tips to correct that. I use Autodesk Sketchbook not Photo Shop. This is also the different markers I used on the left two figures is Spectrum Noir alcohol based, and on the right is Crayola water based. They were two on each page but I used my tablet to put them on the same page prompted by another Arty games challenge that was to draw a rock band that uses magic to gain entry into a temple. That is why I chose to include instruments on a stage for the background.