art consistency or lack thereof

I was going through the drawings I did of the duo from the zine of millie EX series (check it out if you haven't) and I've realised I seem to draw them kinda differently each time.

EX1 duo
EX2 duo
EX3 duo
EX3 duo scene
EX4 duo
EX4 duo scene

(check out zine of Millie EX, if you email in time your letter might be in EX5)