Let's review. Do you remember how to say "I would like" ? Je voudrais. And how to say "painting" ? Peinture. Do you remember how to say "a painting" ? Une peinture. And how to say "original" ? Original. Do you remember how to say "I would like an original painting" ?
Je voudrais une peinture originale. Now you know how to say what you want in French and you can move on to the practice. Au revoir !