1. There should be more white space distributed evenly, especially the margins around the posts.
2. Text boxes in a form should be left-aligned.
3. Fonts across a form should be uniform unless denoting labels or sections.
4. Don't use <br> to separate posts. Use <div> instead.
5. Don't use <center>. Use a style with text-align: center or some other style.
6. Don't use inline styles if not necessary.
7. Don't use the full-sized images. Create thumbnails instead. Request the full-sized image on click.
8. Probably some other things…
