An image must also resonate beyond technique. There are also hundreds of thousands of competent artists who are simply good craftsman-like illustrators. The work is fine, but you can't tell one from another and there is no true originality or unique way of viewing the world. This competent illustrative art also becomes more obvious as a cliche the more you see it. At the end of the day, however, after looking and looking, you must trust your own taste.
Good art comes with many different syles and subjects.
Which style and subject matter really speaks to you, however, depends on how well your personality converges with that of the artist. You might have an eclectic sensibility appreciating many kinds of good art or you might just like the romantic landscape, or colorful expressionistic painting, or Zen-like minimalism. No matter what kind of art really grabs you, don't be afraid to mix different things in one space. You do not want to be ripped off, and in the art world, it's easy to spend lots of money on junk. Again, you must go through the learning process.