These are just straight ball point pen..umm..I dont have the sizes, off hand Id say they were between 5 inches-7 inches.
Two from photo, two from life.(although I really do dislike working from photos, and rarely do it.)
On Paper..no tone(altho in the past I have toned bristol..with a warm or cool water color wash, and then drew in ball point over it)
If you are seeing color or tonal changes, it means two things.
1. you have a good and sensative eye for color
2. its either the camera or my skin tone showing up on the paper while Im close to the paper, to snap the picture(with my cell phone).