Work in progress - do you share?

I've recently started blogging - and also recently got back into doing my own creative work again.  I'm working towards an exhibition, in between teaching.  That  means, very much in between whenever I can scrape a bit of free time together.

There is a temptation to post images of my work in progres on my blog.  But I also have a resistance to sharing my work before it is ready for such a public medium.  Wont it spoil the surprise?  I was wondering how other people felt about this.  Do you share your work?