Definetly you can use a blog instead of a website. It depends on your needs. This is an example of a multi-paged blog that includes a portfolio and info: http://www.ninajohansson.se/
I have visited your blog and it seems that you are using it mainly as an online gallery, then I would recommend you to use at least a template that works better as a photo-gallery. Some free examples:
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A web site is usually used as a portfolio of your strongest work. I use my blog to share my techniques, paint process and to interact with clients and fans.