I have another tip for potential/amateur comickers out there. This one is about lettering the trickiest member of the alphabet–especially if you elect to use the classic all-uppercase style in your dialogue and narration.
This is primarily a kerning issue. Crossbar I uses a lot of white space on either side of itself, pushing the surrounding letters away. When it’s followed immediately by a period or apostrophe then it’s much less obstructive to the reading flow.