The easiest way to post one or more photos to your Posthaven blog is to drop the photos into an email message and email them to your website. The subject line in your email message becomes the title of the post and you can include text above and/or below each image to describe them.
Things change a bit when you post photos using the site editor. Click the big green Upload Media button and select the photo file you wish to upload and add to your post. You aren't limited to just one photo.