This one is nice you use the rubber tool there? I would say use a burning tool when you have done with rubber tool. If you look closely to the image you can still see the horse's white back and below as well. That shows the horse has turned his neck. So he is standing and looking at the right hand side.
You can do alot of things with Photo shop, I'd recommend you to get one.
As far as the camera is concern there are a lot of things which you need to look at, most importantly the price
. Where Canon would be around £7/£900, Nikon could be £1100 to £1300 and Hassleblad is around £25,000 to £30,000.
Then it comes to the actual lens, burst, sensor, image quality, adaptability, speed, viewfinder, ISO range etc.
I'll find some sites for you to look at, which explains properly what you should look for in different cameras once you decide your budget
Now for the above picture can we have more burning and rubbing on the lighten areas so that it looks better?
I'd apologize again for making critical recommendations again, however I am sure you would take them positively as you did before