Importing AI to Toon Boom - low quality. Why?

When importing AI/PDF file that originaly looks like this:

http://s21.postimg.org/llowghshj/sarmata_jpg.jpg

in Toon Boom Animate Pro 2 it looks like this:

http://s23.postimg.org/55z1p0qcb/sarmata_w_toon_boomie.jpg

Why is the quality so much lower?
Any way to change it?

Thanks

Is the result (sarmata w toon boomie.jpg) what it looks like within the software after importing or the exported still from the project containing the image?

While inside a project in Toon Boom software the imported image will be an OpenGL representation for working purposes. This will be influenced by imported original quality/resolution and project/scene resolution. The true quality of the content can only be judged by exporting a file from the project.