Only photoshop. I use a feathered brush around the make the colours in there then I use the smudge tool to drag the colours in and out from the eye. I may make a video sometime so show off this effect. One of the most simple of ways to do it. But looks nice.
I will remember that. I have more free time so I will put that on my to do list. If you like watching speed paints, you can watch my art go from a blank page to something in the link below. This is also where some help videos will go over the summer as I get time. But the first one I do will be the eye one that you see above.