Photoshop Tutorial (Changing eye colours)

I just had a go on Photoshop Tutorial to change a woman's eye colour, and I found my efforts very good.

This was the original photo of the woman.

This was the final results, the woman now has green eyes, although un-natural I think it looks good.

I did this by lassooing around her iris, then holding ALT as I lassooed around her pupil. Then, with my desried eye parts selected I altered the colours, eventually I settled with green.