With Vita, all you need to do is just snap-snap-snap and then you can immediately upload to an imagehost through Vita... pretty simple.
While for the 3DS...
How do I post a 3DS screenshot? Update your 3DS to the latest firmware, allowing registration of (or linking to) an NNID and access to Miiverse. During play press the Home button to pause the game. Access Miiverse, and post your image on the service. Using your PC, access Miiverse to find your post. Save your image, and upload it to abload, imgur, or whatever. Post here.
Finding your image URL on Miiverse can be tricky. Here's some instructions:
You can also right click on the image, select "Inspect Element", then hit the drop down arrow to the right of the automatically highlighted <div class="screenshot-container">. This will show you an <img scr=URL that you can click on to directly access the image, save it, and upload to an image sharing service.
Miiverse doesn't let you save screenshots with right clicking, so Miiverse screenshot saving instructions:
When you find the post with the screenshot you want to save, view the page source (in Chrome, just right click anywhere on the page and it'll be an option), scroll down a bit to where it saysand click that URL to open the screenshot in a new tab. You can technically embed that url in IMG tags to embed the image here, but it's probably smarter to just rehost it like the OP says.
Code:<div class="screenshot-container"><img src="https://URL HERE"></div>
You can also just Print Screen or whatever, but this is faster and easier. :P
It's free promotion, Nintendo, come on.
Now it is *tolerable* while before it was *unbearable*
They fixed it? How bad was it before?! My load times are still horrible.
Photos don't have to be mine right? Really excited for this game.
EDIT:- Oh wait, those are direct screencaps aren't they? Just noticed the picture info from the posted screenshots. 400x240 is really that much smaller than 960x544.
P4G (in the special features)
What a resolution difference