So basically i can only do screenshot? Or i can use the whole animation?
With the studios made by Illusion, legally you could only use a content (screenshot or animation) that had the the copyright notice on them. But there were always the illegal way (using a modded version of the studio that don't add the copyright notice).
It was a risk, but that payed. The risk that Illusion starts an international lawsuit was low, and it happened that they just never really cared about what was done outside of Japan.
With IllGames studio, it's different. They never communicated about this, don't explicitly give you the authorization to publish the screenshot/animations from the studio that come with it, and the terms of service for that game also forbid you to use mods. Therefore, so far I would say that they wouldn't really like it.
But, it's like everything, you'll make a small game that will surely fly below their radar, and it would cost a lot, both in terms of money than in terms of time, to perform an international lawsuit. So, the worse you risk is that they explicitly ask you to stop if you don't want to be sued, and/or have you kicked out of whatever platform you use to fund your game.