Do not know what to say when on your artist blog.   Before you upload any art work, try talking about your art, to family, friends and yourself.  Talking about your art makes it real, makes you real and gives you a great opportunity to develop your story.   You might begin to see a story developing about the piece, and also some thing thematic about your entire body of work. The things that you talk about they belong in your blog post.

As you are talking about the work, there are probably several stories that come to mind.  Telling the story will make you and your art real for your collectors.  The story could be why you chose the composition, what you found challenge and rewarding about the creation,  perhaps a memory that came to you while you were talking about the piece, color, size, shape -- Pretty much anything relevant to your masterpiece.

Your collectors are buying you not just your art.  They need the story, and at some level you need the story too!  There's more... There's always more.

Just imaging this conversation in a collectors home,

Collector:

Oh do you like that piece, me too!  The artist said, he really enjoyed painting children's faces because most of them have expressions that are not necessarily innocent, but seem to be capable of going from angelic to mischievous   in the bat of an eye.  I found it on the Internet and just had to have it.

Collector's Friend:

What did you say his name is?  Where is his website?

It could happen, it can happen.   Write your story, entertain your tribe, and keep painting.