Where can I check the image catalogue available for fiware-paas (Pegasus) to choose my virtual machine to GE deployed from?
Login into the FIWARE Cloud Portal with your credentials. Press on Cloud link on top, then you should see a menu to the left and go to Compute->Images.
All the images available in the FIWARE Catalog will be displayed. You can always deploy a VM from any of the images by pressing the Lauch bottom that appears at the right side of the images.