Can’t back up enough to catch the entire image? Photomerge is your friend.
Line up the left side – click – hold level and move right with at least 25 per cent overlap – click.
In Photoshop CC 2017: file – automate – photomerge – browse and select your images – check blend images together – I also checked perspective and content aware fill transparent areas – click O.K.
This gave me the background images. I then used select – select and mask to bring in the foreground subject.
Finished it off with Topaz edits and some lightning using Photoshop brushes I found free (Brusheezy!?).
BOOM!! GO LANCERS!