Does anyone use gimp? I have a premade psd file and I'm having trouble coloring the different layers. This is a free base for drawing / coloring and the layers you are supposed to color on are labeled "color here" but when i pick a brush and try to color nothing shows up. Any idea what I might be doing wrong?

If I try to color on it and then go through and hide all the layers I can see the colors (even locked into the lines they were supposed to be) but they aren't showing up in the drawing.