There are two posting styles available in Reddit. You can post as a link or as an image. Both styles of posting will include the title of the post as well as the link, but the image sizing will appear differently.
When posting as an image, your posts will appear as large text with the link included as text, as in the screenshot below.
When posting as a link, the post will appear with the link in a similar text format, but with a smaller image that looks more like a thumbnail.