Hi,
Do I understand that you want to have hi-res photos/art with a thumbnail to click on to show the enlarged high res photo?
If you use the gallery function the thumbnails will be generated and you can choose whatever size for the thumbnails that you want. All photos will be automatically uploaded when you publish.
Realize that high res photos will take a
L O N G T I M E to load. You should not have very many on a page. (5?)
It will also take a long time for the "Publish" function to complete.
Or......do you just need a quality image to load? The
Pix Resizer works fine for that.