Hey Jody Meyer, thanks for your advice.
So I took the decal which i created in paint and in photoshop i converted the colors to cmyk and i also changed the dpi to 300 and also i tried with 600 and 1200. But still the results arent that great in terms of the resolution and also the coloring, I took 2 pictures of my minifig and the torso to show you guys and ask you if the torso is printed in the max resolution a 600x600 dpi printer can print, and also ask for an advice with the coloring, maybe which cmyk palette i could use in photoshop, I hope someone can help me out its really not that easy to get this right hahahaha.
https://imgur.com/IXLAQLw
https://imgur.com/DJD8tdK