How Do I Make A Complete Python Executable

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Python

application

I am using pyinstaller, and it works. i do the comand:

pyinstaller --onefile --windowed app.py

and it works, but... it doesnt. I have the app and everything but it doesnt open because I have a number of images that arent in the build.
The script references them like so:

newicon = PhotoImage(file='icons/new_file.gif')

It works in idle if the icon file is in the files root, but how do i add it to the pyinstaller path? what do i do?