I don't like a lot of the recent attempts to take comic book characters who were designed for stylized line art and turn them into fully-rendered, close-to-realistic paintings. Most strike me as boring and forced, especially when long-established super-heroes suddenly start looking like the artists' friends who posed for reference. That said, there are about three exceptions and the main one is Alex Ross. He has an amazing way of making the characters still look like the characters and to keep the excitement intact. His website is full of examples. As you'll see.