Hi,
I don't have Corel Painter Essentials 2, but my guess is that you can't create new Nozzles or load extra Nozzles or Nozzles libraries which is what you'd need to do in order to have more Nozzle images to use with the Image Hose brush category.
Most of the "lite" Painter versions don't allow us to add extra brushes and art materials libraries and the cabilities for creating are very limited compared to full Painter versions.
Sorry.
I don't think you would be limited on the number of images you could use for Clone painting.
As to using more images when Clone painting, here's what I'm guessing you should be able to do:
Just open the image you want to use as the original, Clone it, select and delete the Clone Canvas imagery, choose a Cloners brush variant, then begin painting on the Clone.
You might try posting your questions in the Corel Painter newsgroups on the chance someone there has Corel Painter Essentials 2 and will be able to let you know for sure what you can do.
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Good luck, and Happy Thanksgiving!