Multiple possible solutions. Very interesting image though. Thank you!

For those who don't want to spend 3 hours working this one out:

R1 4 and R19 3 both start on C11 and it's semi-symmetrical.

*not* very logical.

Further to JazziP -
R12 is C2-10 and C13-24 inclusive
R13 is C1, C3, C5, C7-10, C14-22 and C25

It's basically a little devil with horns and wings.

If anyone can solve Mark's other 'It's raining' they deserve a crown.

Bad puzzle, i don't understand why people seem appreciative of these puzzles.

A picross would be a logical puzzle. This isn't.

Took far, far too long to guess this one.

This is not working. Even not with hints.

Does the devil has an hook in his wing?

Amazed I got this done even with hints.