Yes, it is Jon Gosselin posing with some fans. Based on all accounts, the pictures are of Jon Gosselin posing with fans at various events around Pennsylvania. See related links for various articles about the pictures.
Jazz (1947) is a book of about one hundred prints based on paper cutouts by Henri Matisse. So it is not one picture, nor is it a painting.
Some Disney princesses that were based on a true story besides Pocahontas are Mulan and Princess Jasmine.
The painting of Jesus was based on historical and religious accounts of his appearance.
Based on historical accounts, Pocahontas is often depicted with long, straight hair. This portrayal is common in many paintings and illustrations of her.
No, the grinning bobcat from Disney's Pocahontas is not a real constellation. Constellations are patterns of stars in the sky, and they are based on mythical figures or objects, not characters from movies.
The artist makes a picture of him/herself.
Quite simply the materials used to paint the picture. Pigments used for painting may be, among other things, water or oil based. Generally, but not always, oil based paintings endure longer.
Painting?
John Smith of the Pocahontas fame has featured in numerous films based on Pocahontas herself. There have been 5 films with John Smith featured. The most famous would be the Disney version released in 1995.
calligraphy
You are allowed to take a photograph of ANYTHING in a public place. YOU may also be able to take a photograph of something in a private place if YOU are doing so from a public place - but there are expectation of privacy limits that YOU may violate) So - if YOU are painting a portrait of anyone based on YOU seeing that person in a public place - yes - you can do it. (Example - if you took a photograph of that player walking in public - and then painted the picture based on YOUR OWN photograph) However - if YOU are painting that portrait based on Published photographs or video images (say as on tv or in a movie) - THOSE images are copyrighted and you cannot legally use them as a source without the permission of the copyright holder. Now - what you may DO with that picture or painting is another story