Pretty good start. The writing seems decent. I felt invested in what was going on.
I like the art style, the backgrounds and character designs are good. Some of the poses are kinda stiff (the devil slapping herself, the detective character pushing the devil away). The staging for the office could've been a lot better. Play around with different camera angles, the visual storytelling. Having almost all of that long scene with those characters keeping the same spots on frame, 3/4th and side angles, it was distractingly boring.
The highlights/shading are a little much on the faces. The clothing/body shading seems fine.
Solid starting place. I think with your class work, this could be something good.