instead of the "guy" crossing the bridge, suggest substitute with ships/boats below it.

take care of the blending of the bridge and background image, so that they look as one.

perspectively speaking, the right side of the bridge should be smaller, since it is the furthest part.

it looks like an old postcard.... nice

The wooden mannequin ruins the illusion of this piece. He just looks out of place, proportionally and color-wise. I agree, either ships beneath, or a bunch of tiny cars would fit better.

Try to manipulate the point where the bridge touch the land so the vehicles who pass can continue their journey in the road :p. There needs a path becuase it seems that you have not access to the city.
I agree for the wooden mannequin, looks like e giant who has swallowed the colors of the city, and because of him you are loosing the idea of an old postcard.
Good luck.

yep, the wooden figure doesn't fit, try to blend the bridge in to the picture and you should cork a bit on the reflections. in high resolution you can see the reflection details that it doesn't fit.
All the best

Larger than life concept there.