ever since I saw the pictures of a friend taken using Lomo Fisheye 2, I've been itching to get my hands on it... sadly it's easily not available here. sniff sniff
out of curiosity i looked up a couple of tutorials on how to achieve the fisheye effect. it needs much more tweaking than this but i think i can live with it (below) for now.

this is the original image.

Using the ellipse select tool, i selected a circular shape and pasted it onto a new layer.
After that i applied the Filter -> Distorts -> IWarp effect - selected a small radius to distort, and then kept clicking repeatedly until the head and shoulders appear to be bulging out.
To make the edges appear rounded, I used the Filter -> Distorts -> Lens Distortion tool. Depending on the effect you want to achieve, you can either apply this to the upper floating layer for a more obvious look, or the original layer for a subtle effect. I find that I like the effect best at these settings: Main -5.6, Edge 84, Zoom 9, Brighten 68.
I'm still not satisfied, but I guess practice makes perfect. Now if only I had that much time to spare ... @_@