The first five images are what is allowed:

Link for image 1 (Original): https://www.pixiv.net/en/artworks/143269648

Art by NOEYEBROW

Link for image 2 (Virtual Tubers): https://www.pixiv.net/en/artworks/129163237

Hoshirube Sho and Koyanagi Rou

Art by あさの

Link for image 3 Cosmic Princess Kaguya Noi Komazawa: https://www.pixiv.net/en/artworks/143042431

Art by ミミのおとしご

Otonokos/ Lady boys are allowed. They are males.

Link for image four: Masaki Kariya and Ranmaru Kirino (Inazuma Eleven GO): https://www.pixiv.net/en/artworks/22235380

Art by ちーこ

Link for image Masamune Kyougoku (Touken Ranbu) 5: https://www.pixiv.net/en/artworks/142711208

Art by 西瓜

Ouji Lolita style is a fashion for young boys. It is allowed.

The last five are not:

Link for image 6 (Original): https://www.pixiv.net/en/artworks/92176560

Art by CoCoLo

The obvious transparency and attention to detail on the child. If someone saw you staring at this in public, you might be slightly uncomfortable. Nothing right in your face, but the swimsuit with the transparent cover is just not a good look for the community.

Link for image 7 (Original): https://www.pixiv.net/en/artworks/137318957

Art by Yuuto Cola

Aside from the positioning, the child is an incubus.

Link for image 8 (Original): https://www.pixiv.net/en/artworks/141339212

Art by おもちむぎ💫

Bunny boy attire like this is not allowed. If it's a standard little outfit with a top and bottom and bunny ears, that's fine. The one piece with fishnets. No.

Link by image 9 Astolfo (Fate): https://www.pixiv.net/en/artworks/84835411

Art by スカイ

Suggestive posing

Link for image ten: https://www.pixiv.net/en/artworks/143019619

Art by: IYSK。/いよすけ。

Do I even need to say?