The last consideration is price. If you like the image and the elements in it and the emotion it invokes, if you have a place to hang it or display it on an easel, and you know what your budget is, only THEN do you decide if you want an original, a limited edition print an artist's print or a remarque. It's all relative to a person's financial position, interest, and needs. Some people spend hundreds of dollars on antiques, special glass or porcelain objects, hot rod cars and other collectibles and hobbies. And some people spend hundreds of dollars on paintings.
Some images are very detailed and because of that take more time and therefore cost more money.
If you want to buy an original painting that is already framed and matted you will pay more than if the original was unframed. The infamy of an artist also adds the value. The more well known an artist is the more the painting is valued. Some of the best buys of original works are of up and coming painters. Many artists now have original works professionally appraised.