While making a post, if you scroll down, beneath the "submit reply" and "preview post" buttons, there's another area called "Additional options". There, you'll see a button called "manage attachments" and that's one way of uploading/attaching your pics to the post. There are size restrictions though (1280 pixels wide and/or 1280 pixels high).
When I look at the properties of your pictures and go look at the source pic, that is the size I see, i.e., the same as is in your posts
http://farm9.staticflickr.com/8480/8...89eef696_m.jpg
So I'm wondering if what you're inserting is the thumbnail of the pic you're wanting to insert, not the original size?