Bitmap vs. Vector tools

I have never worked with graphics tools before until I came to college and until I got my own computer and took this class. I did not start using graphics tools until I got introduced to Photoshop and Fireworks. In this class I got to try the Bitmap and Vector tools in the Fireworks textbook lessons I went through.

If I am not assuming wrong I think the image with the skull was created with vectors because it looks like it's not a photo and had to insert text (Fight!).

Next the photo of the woman I think is a bitmap because there had to be some retouches for the glow effect.

Finally the image of a man screaming looks like it was created both with bitmap and vector because of the photo of a man and the graphics that were added to it.