Wowowowowow! :D My first hanjie that hasn´t been solved by anyone else :) As a "guessing game", it was not as difficult as it seemed at the beginning.
SPOILER: I would have to reveal all squares to avoid ambiguities, therefore I make it different... Start with R1/C12-15. Make a "line" to both sides (C1/r7-9; C16/r5-6), there is no "loose" line except two dots as eyes. And to make it even easier, the vertical "seven" is in C9/r15-21.