I left the foreground intact in this image to show the method I use for focusing on SP's.
I take a lot of SP's. Sometimes I am alone and other times I have company. I always do my set up and test shots first, using either another person or item in front of the camera. That way I can get my composition and settings right. I use the remote on all my SP's and either I will have someone hold the remote and press it when I say so(usually if I am too far from the camera or the pose is too complicated to get together in a matter of seconds)...or I will hold the remote myself. If I am doing an SP where the remote will be seen...then I set the camera to self timer and press the remote and drop it. This gives me 10 seconds to finish the pose and for the camera to stop any shake from the dropped remote.
With focus I usually use Autofocus. But there are occasions the camera has to hunt to much and doesn't grab the focus..in this case I set a subject (person or object) in front of the camera and do a manual focus....I note where they are positioned and then take over that spot.
So you left the foreground there to show the remote and stuff but, I just LOVE the way it looks! I think it works for me 'cause of the unorthodoxness of it, and how that really fits with your pose.