I'm pretty sure I haven't made any mistakes, yet when I click on ''check this puzzle'', I get "Invalid answer'' message. Is something wrong with the site, did I make some mistakes or maybe the puzzle has more than one solution? Below You can find link to the picture of my solution:
Ostrokat - There are multiple solutions. Erase the whole block of squares where you made an eyebrow looking thing, and that single dot just below it. Erevos left clues for that portion in the description of the puzzle.