Problem of sizing of photos in Blogger

Sorry to bore you with this topic again, but I've been trying out
uploading photos of various sizes on a New Blogger site (which
I set up for teaching purposes). I found that I've got the same
problem with my New Blogger site as with this one, in that all
my pics are set at about 300 pixels in width, regardless of the
larger widths of the originals.

Here are three versions of one of my holiday pics to show you
what's happening ...  (the widths are 1024px, 800px & 450px)

None of these look very good (especially the smallest one), until you
click on the photos to enlarge them.

In New Blogger, you can manually scroll through the enlarged images,
if you so wish. The new layout reminds me of Picasa Viewer, which I
think Google is using in New Blogger.

As I've said before, I think the new layout of photos in Blogger is very
poor. I wish to showcase my photos for you ... I don't wish to show
you poor quality miniatures. So in the next few months, I will abandon
Blogger and will switch to using WordPress or perhaps Tumblr.

One of my favourite WordPress sites is Donncha's photo-blog.
Here's more info about Tumblr ... http://en.wikipedia.org/wiki/Tumblr