HELP!

I need some help with editing a photo.

I can do the basics with photoshop such as improve colour and contrast etc: but…

I have been playing with removing unwanted people from a photo of my brothers rail railway enthusiast.

This is the original:

This is my first effot.

Not too bad for a first attempt I dont think. Sorry about the small size, but I went wrong somewhere big time! I really need the photo to stay the same size iff possible!

Can anyone do a better job?