To give this picture a whole new color, you must first make a new raster layer. You may do this by going to Layers > New Raster Layer
Now you must go over to your material palette! Simply click one of the colors
And after you've done that, go to your Gradients tab
Now you can either use the default gradients, or make your own. If you don't know how to, click here to learn how! Now after you've chosen a gradient, press okay and then flood fill
your raster layer with that gradient.
Once you've finished that, set your layer to Hue. You should see your picture change colors to your gradient!
