Either u wait for the golden hour or use ps to do it.For easier way of doing it,check out here.I've downloaded a few actions where artificial sunlight/rainbow are added in Photoshop actions . Cheers

I personally believe other than photography skills,you still need to enhance your image.
This is one of the website where i've learned editing skills from day 1
http://www.photoshopessentials.com/

Guys, i need help on editing potrait photos. Any tips on getting this kind of soft brightness/contrast? If possible,kindly explain the steps done in photoshop or any website that teaches you how to do it
By the way,is noise added in?