Mod requests (orders).

2 Pavlinho
That's correct. Ideally, you should set the camera position and lighting in a way that resembles the third game, render the animation (you need to know the required number of frames) with an alpha channel, and then TrueMefista will put it all together in the style of a GIF, but in a format that the third game's engine supports.
However, in my opinion, the color scheme and proportions of the models differ significantly from the third game. I would suggest using models from the 6th or 7th game instead, as they have a similar level of realism in proportions, rather than stylization, just like in the third game. And the color scheme can be adjusted in Photoshop or similar programs.

2 TrueMefista
It would be best for you to write a technical specification outlining which animations are needed, how many frames each animation should have (maybe frames per second? I'm not sure what's best), and which creatures. If the request is clearer, someone might be willing to take it on.