Be sure to include the image in question with a link (just put in the URL of the image). Or, use the <img> tag if you want more control over the size of the image. For example, the image above was created with the following code:
<a href="[IMAGE URL]"><img src="[IMAGE URL]" width="640" height="400"></a>
Try to focus specifically on the art and say more than whether you like it or not. Bring up specific details in the art! Consider composition (line, shape, negative space) and techniques used to get certain effects (like simulated depth of field or use of gradients). If you aren’t sure what to say, look at this list of topics in Art Criticism and Analysis. Also consider CG art in the context of the story it appears in.
Please mark CG’s from character routes with [spoiler] tags (CG’s for character introductions are fine), providing adequate context in parentheses.