As the blog plugin of Flux CMS supports the MT Weblog API, you may want to use a desktop client for blogging.

The access point URL is http://yourdomain.com/blog/xmlrpc.xml (replacing "yourdomain.com" with the url of your Flux CMS...)

ECTO is a great desktop blogging client, which utilises a lot of the potential of that API. One of the features is a preview pane, where you can immediatly see, how your post will look like on the webpage.

To make it really look like your page, you have to adjust the template. Go to "Settings" -> "Editing" -> "Viewer" and then put this html into it. Adjust the link to your CSS accordingly.

Image upload: It makes sense to keep some sort of order with the files you upload to your server. I recommend adjusting the path in image upload to /files/images/blog/

Also take a look at your scaling and thumbnail settings. A typical width is 480px.
Read whole post for screenshots.

kev @ 15.08.2010 13:36 CET
To circumvent the problem of Ecto 3 not writing border=0 (resulting in an ugly blue border around your image) put the following code in you Flux CMS theme/css:

.post_content img {border: none;}