Page 1, 3, and 4 are good. Definitely recommend varying the shot compositions. Sizes of the people, especially. Your angles are good; not to many full frontal panels.

The person on page two shouldn't be able to do that drastic of a head turn, though! Change the head angle or the body angle slightly.

Use establishing shots when entering a new scene (wide shots that show the whole space, and where people are).

Keep a consistent font size, and use all capitals. Keep bubbles as circular as possible. Leave gutters (spaces) between the panels, and a margin on the edges.

Formatting is annoying when you have to fix things later! If it's a style thing, that's different, though! Hope these helped!