First, we’ll add a neutral background. Create a new layer and drag it down to be the first/bottom layer. In this layer, using the Rectangle Tool, draw a rectangle the same size as the page using the beige color, #EFEAD9. Lock the layer so it doesn’t move around on you (in the Layers panel, click the empty box next to the eye icon).
Now, select the slipper and click Object > Arrange > Bring to Front. Then change the color to the red, #E8412F.