... having worked in the graphics industry for 60 years, and I still work with PhotoShop daily. The lighting is consistent between the image of your great grandfather and the near background, as is the foreshortening of the scenery in general, and the transition between the ground on which he's standing is seamless. It wouldn't be in a studio shot. In the early 20th century, as beautifully as they could paint theatrical scenery, it is always immediately recognizable as such. And then there would be the question, what would be the point? He works outdoors every day, so why not shoot the pix outdoors? Though you're right, the bike in the first shot does look strangely truncated. On closer inspection, though, one can see a pedal and the spokes of the back wheel, as well as the seat and the shadows of both wheels. It is a visual mish-mosh, but it's all there, it's just that the frame of the bike is directly behind the front wheel and handlebars. So mystery solved!
You're welcome! 
And I LOVE owls! That looks like a great horned owl.
Edit history
= new reply since forum marked as read