I think just making the road wider would have done the job!
Or you could just embrace it, maybe this man really is a giant in a city of dwarves

Yes, making the road wider should work.

Thanks!!!

http://www.futurepig.com/rlyeh.html

Say he is on a roof with his alien shapeshifter pals pretending to be a fire hydrant and newspaper dispenser. Explaining the duck will be harder.

You can leave it alone, as a 'surreal' or 'primitive-style' artwork. It is like two images collaged together. You did magic. I saw the perspective problem, only after you wrote about it here.

If you want to physically reset the two images, in a graphics program you can scan & copy it into two separate images. Each image, you carefully remove the parts of the other image, and fill in the cityscape in the blank spaces in the 'background' image. If you want to use them together, set up another new (large) image, decide on a horizon line, and put in the background and then move the foreground around where you want it.

You can do the same with low-tech: Xerox copies of the full pages, plus about 3 reduced sizes of each. Cut out the foreground parts and copy each half as a separate xerox. Fill in the background as needed. Decide on a horizon line for each image. Collage the two together (lining up the horizon lines) and xerox or scan.

Turn the surface he's standing on into a balcony on the second floor of a house.

Well. Sometimes irreal perspective can be used to maximize what you want to show on the drawing. In this case, the odd looking dude from the general view. It is an art thing.
The drawing looks good in any case.

That can be the story if you just stick to it ;)