need help adding a porch railing

hi! i'm new to the forums, and i was modifying a picture of the house that my family's building. it's near completion, but i wanted to get a look at what the finished house may look like. how can i add a realistic looking porch railing to this photo?
http://i5.photobucket.com/albums/y199/antihero496/DSC00864.jpg
thanks for your time.
i hope to actively contribute to the forums as well.

You might try finding an image of a similar porch rail to the one that will eventually be used and then copy/paste/scale that into the image of the house.

Something like this might do.

Hope this helps.

thanks a bunch!
i tried a different porch, and it's looking great!