title: How to use custom point style in plot?
body: <p>I am doing a dimensional reduction experiment, where a set of faces will be places onto a X-Y plane. I want to show the real face at each point in the plot (Example: <a href="http://jmlr.csail.mit.edu/papers/volume11/venna10a/venna10a.pdf" rel="noreferrer">Figure 10 at the page 476</a>). Can I do this in R? Thank you.</p>
  
  <p><img src="https://i.stack.imgur.com/aFEjy.png" alt="enter image description here"></p>