Paint in some shadows
To create shadows on the floor or against the camera body, you’ll need to paint them in manually. Go to Layer>New Layer, then go to the Toolbox and click on the Brush Tool. Assess the shadows in your main camera pic and if the shadows are quite hard you’ll need to choose a hard-edged brush. If the shadows are soft and diffused you’ll need to choose a soft-edged brush. Set the Brush Tool Opacity to 100% and change the Size by using the [ and ] keys. Paint in your shadows and drop the Layer Opacity down until the shadow looks natural. You also need to drag your shadow Layer so it appears below your portrait. It can also be handy to rename your Layers like in the pic above.