I agree with the comments on the last doodle being the strongest of the four presented. Very nice. I think the two reasons why I feel this was are 1) the image has room to breath on the paper and 2) the unfilled lines are more fitting with the pen.
I can't tell with the top two how they're colored; are they colored in with red and blue pens or markers? Have you tried sketching out the lines and then maybe taking acrylic or oil paint for your color? Granted, in order to do this you'd have to take your work outside the realm of classroom doodling, but I think it could be a very VERY good idea.
Also, by working on large sheets of paper and purposefully not using up the whole sheet, perhaps you can break out of the box that IMO detracts from the other three. I think forcing them to be contained within the box represented by the full sheet of paper is almost suffocating the design. Open it up, says I!
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