@Captain J: Those screenshots are too large to display on my screen, and putting them in a spoiler makes it impossible to scroll right as well, meaning you actually have to right-click and open the image in a new tab before you can see them, which is highly inconvenient for most users.
Imgur auto-generates thumbnails for you, which are linked on the upload-complete page. You can easily get them by simply adding 's' or 'l' to the end of the filename of the uploaded image, though, which makes things simple. The best way to link big screenshots is to actually show a thumbnail in the [img] tags and wrap the whole thing in a [url] tag that links to the full image, like so:
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[url=http://i.imgur.com/bkKCm6u.png][img]http://i.imgur.com/bkKCm6ul.png[/img][/url]
Note the 'l' right before the .png extension in the URL in the [img] tag. This code renders the following clickable image link:

With this, you can show a proper preview of the screenshot while still allowing users to view the full resolution, which is quite nice. This helps especially when trying to show off something, as a thumbnail is much more likely to catch someone's attention than a spoiler block with some text. Though if you're going to post more than one of them, you're best off using the small thumbnails (add 's' before .png) instead so the thread doesn't get all stretchified in the vertical direction.