You may notice that when you add images to a blog post it tries to display them at full size, sometimes cropping an edge. To make them easier to view, here's a trick.
After adding the image to a post, look at what the blog engine dropped in to your post editor. It looks like this:

<div class="image_block"><img src="http://hcmc.uvic.ca/blogs/media/blogs/cgtw/poster4.jpg" alt="" title="" width="987" height="1281" /></div>

The width and height attributes are representative of the pixel size of the image. We can adjust them to make it fit a little better by fiddling the numbers. If we reduce each number by, say, 50% we end up with this:

<div class="image_block"><img src="http://hcmc.uvic.ca/blogs/media/blogs/cgtw/poster4.jpg" alt="" title="" width="494" height="640" /></div>

Notice that these are rounded to the nearest whole number. If you try to keep image no wider than about 400 or 500 pixels they'll look better in the blog. Also, please note that this does NOT change the size of the original image. It ONLY changes the display size in the blog. Right-clicking and saving will store a full-size version.