This was done in photoshop elements 6 - its all I have for editing and its powerfull enough for most work!
Much of editing is just playing around as you learn - though look up levels (I think you have done a levels edit already) curves, sharpening, noise removal and you will start to get a better hang of things
And as I have saved your shot I just realised I have the exif here now -- ahem
shutter speed is 1/8sec, aperture f4.2, ISO 200.
generally its not advisable to go under 1/60sec when hand holding a shot - and with lenes its often best to keep shutter speed as 1/focal length - so say you were using a 300mm lens your min shutter speed should be 1/300sec.
I think in this case boost ISO to 400 to get the shutterspeed up - granted you get more noise, but wildlife needs a good shutter speed as does handheld. Your aperture is fine