noticed there are 4 different types of instruction manuals (at least for large sets):
Type I: Similar piece colors are not very distinguishable (especially Dark Gray and Black). Some building steps could be clearer (for example, adding arrows or changing the point of view). Similar-looking pieces are sorted in the same bag. Bags are not numbered.
Type II: Same as Type I but with numbered bags.
Type III: The piece colors are a lot closer to the actual pieces and are easily recognizable (Black has even a white outline). All building steps are better described. Pieces are better sorted in the bags. Bags are numbered.
Type IV: Same as Type III but with the pieces to be added in a given step outlined in yellow or red.