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Not sure why that png (and lots of others too) is not getting copied into the images sub-directory of your user application data folder for SQL Developer. Probably each component is supposed to be responsible for checking that directory and copying images over there as needed.
I logged a bug:
Bug 14770237 - EXPLAIN PLAN EXPORT HTML NOT COPYING ALL REQD PNG FILES TO IMAGES DIR
You can extract it from your installation's ...\sqldeveloper\sqldeveloper\extensions\oracle.sqldeveloper.jar file, from directory \oracle\dbtools\raptor\images using one of the unzip utilities.
SQL Developer Team
fixed this in latest code line.