Ouch, that sucks, and worse yet from a friend!? Sadly ... that looks like it's a body shop repair. I think any attempt at PDR will not be successful as the paints tensile strength is probably maxed out and will loose adhesion/crack/delaminate if you try to bring it back into shape. From the shape of it, looks like it was imprinted from behind by a cross member or window mechanism, so it’s been stretched in two dimensions, even worse for PDR.
I agree with "David Fermani" & "Twista616" regarding the way a “cheap or budget� body shop might repair that depression in the door. Any decent shop will pull out as much of the depression as they can before using as little filler as possible. Your problem (as already mentioned) is paint match for that light metallic paint.
If you decide to fix it, try and find the best shop in the county as only a good shop with a good spray-man is going to get a good match on that paint.
Hope this helps.
SIDE NOTE TO "TWISTA616": I only say this for its educational value, not to cause any static. Here’s a little history on the reference to Bondo. When I was a young tike (too many years ago), there were few 'body-filler' companies supplying the stuff. The biggest one in those days was from a company which labeled the can of filler with one big word across the whole can ... as you can guess it said nothing else than: BONDO
Today The Bondo Company (now owned by 3M) is still one of the largest suppliers of automotive, marine, household repair, fillers, adhesives, thinners, paint and paint additives in the world, including supplying ‘private label’ fillers to the majority of the lines out there.
This is no different than when you ask for a Kleenex and they give you any brand tissue, or ask for a Xerox and they copy it on a Panasonic. These names have become synonymous with the product and still the leaders in their respective fields. I know you can’t find a can of old-school ‘Bondo’ anymore, but any filler with the 3M icon on it somewhere is a Bondo product, (and that’s most of them). I almost enjoy when those old references are used today, and you’re making this old man feel older. Sorry if this old geezer is rambling, only sharing to help, not to hurt, ridicule or offend.
I'm really impressed you learned your trade in a custom shop and not a commercial, get-'em-out-the-door shop. It shows in your replies and you’re certainly lucky to have that experience. That’s where I started as well.