Oh my god you finally posted a new version (I suppose?) now LISTEN UP!
It's VERY important because I really like your gallery, you seem to have a lot of time to meticulously put each image in a very specific scenario and folder which makes it pretty easy to find stuff depending on what needs to be posted in thread. (Personally I just name each image as the creator's name and add a few random numbers, or if their username ends in numbers I add a single repeating letter and just toss it all in one folder)
Whenever you're looking up new material on tumblr, always ALWAYS right click and go for 'View Image'. You'll be on this screen. Now look for the last number it's usually 540. Rewrite this to 1280 but don't touch any of the parts of the code.
Why should you do this you ask? Because this ensures that you'll get the highest resolution of the image possible. I wanted to tell you this for sometime since it pains so much that you have such a rad collection but at least half or more of it is full of lowres images with artifacts all over. I can't really help you with other sites such as pixiv or pinterest, they are a different sort of nightmare, but usually going for right click + View Image is the best course.
I'm not telling you to go back and replace all your images with the highres ones but PLEASE just pick up this habit from now on. You'll thank me later.