Hello T
Depending on what software you have there's dfferent ways of going about it.
I have Photoshop, Coral Paintshop Pro, Serif Photoplus, and the one I did this in which is Microsoft Digital Image Suite.
I first de-saturated the photo, hence turning it black and white, then choosing a very small brush and picking a colour I just painted over the statue twice, second time to bring out the highlights.
Hope this helps, I would be only too glad to do it for you if you send me a copy of the pic and what you want doing, that's if it's not private of course.
Regards John.