First of all, welcome to the board ray
About your doorway page, I'm sure you did mostthings right when it comes to making this page SE friendly. But one of the things I noticed is that you have a very long page with only 2 links to your paysite on it, a banner on top of the page and a textlink on the bottom.
IMO it would be better if you had a link underneath every set of pics of a particular model that says something like: "Click here to see all of *model's name* pictures" that goes to one of the pages of your paysite.
Now if a surfer enters you page, he has to scroll all the way down to before he gets a chance to actually go to your paysite, my expercience has taught me that almost 0% of the surfers is going to click the top banner like it is now. You have to try to send them to your main site asap. You can enrich these extra links with adding a "title" text in the A HREF tag if you want.
I personally would stay away from putting doorway/content pages on free hosts. I don't see a problem of them being all on the same domain. Ofcourse if you have another domain on another IP you can put the pages on that one also. Getting linked to from different IP's can always help.
If you're planning to build more of these pages I'd make some sort of SITEMAP which basicly is just a page where you link to from your main page and that has all the links to your doorway/content pages as well as all the links to your paysite's pages on it. This way the SE spiders will probably visit them faster and more frequently.
Anyway, just my $0.02
