@itszaiii Try making a new layer, swap to colour mode and paint over the iris in the new layer with a really weird colour at first to see the effect fully.
Then hit ctrl+U and use the hue/saturation and lightness controls to change it to how you like it.
@itszaiii I'm just noticing how very dark they are - that'll be contributing to the unnatural look issue - if you bring out the iris details first it should look a bit better...
Then hit ctrl+U and use the hue/saturation and lightness controls to change it to how you like it.
http://365project.org/discuss/tips-n-tricks/2952/photoshop-eye-edit-tutorial
I experimented with layering and colors on Picnik, since I have photoshop only at work. I can't seem to get this right.