By far the easiest way to do this is to use Tumblr's built-in "tag" feature. A tag is just a label that you can place on a post. (They could have called this feature "labels" or "categories" or "topics" or a dozen other things, but they went with "tags".) The tag can be anything you want, although of course people usually choose a descriptive short word.
Anyway, after you place a tag on a post, it will show up on an automatically-generated page in your blog's /tagged/ area. All posts that carry the tag "art" will show up at /tagged/art, posts that carry the tag "earwax" will be visible at /tagged/earwax, and so on. (These pages are called "tag pages".) You can add multiple tags to a post, so if you have art made of earwax you can put both of those tags on the post and it'll be visible in both /tagged/art and /tagged/earwax.
So, all you have to do to start using this approach is to find your existing art posts and edit them to add appropriate tags (maybe "art", perhaps plus other tags) to them. You can use the "mass editor" to do this to multiple old posts at once. As soon as you add a tag to a post, the post will appear in the corresponding tag page.
When you add more art posts in the future you can specify the tag(s) at the time you make the post. And then, as a separate second step, you might choose to add links to your blog (usually to a header or sidebar) to make it easier for people, including yourself, to get to these tag pages. You don't have to use the "add page" thing to do this -- you can create links that refer directly to the tag page.
In fact I'd avoid the "add page" stuff until you have a real need for it.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.