I assume it is something on the lines of a "magnification" plug-in your after? I find dpy's rotate/zoom ideal Just remember to select only the area you wish to enlarge.
Edit - try this one out http://forums.getpaint.net/index.php?showtopic=19514 this might help
Have you tried this plug-in http://forums.getpaint.net/index.php?showtopic=24205 from dpy ? Make a selection on your image and then run the plug-in zoom to your requirements Once installed you will find the effect under the Distort sub menu in the effects tab.
Thank you I cheated a little (or a lot perhaps) and used some pre made custom brushes, it was done on one transparent canvas and just a little trial and error to "brush" in the right place. I'm happy with the result even though I was lacking one vital ingredient - the candle -