Lot logical at all... couldn't even get close to solving this one :(

Got it. Total guessing, please don't post puzzles like this.

HINT:
The 6 in the bottom row is the smile and is in the centre, the two rows above are just the rest of the smile.
Rows 1-3 are symmetrical if you ignore the last column.
Row 7's two is in the centre, row 6's one is diagonally up and to the right of it.

Thank you for the hint, would never have got it otherwise.

Another thanks for the hint, would have defeated me otherwise.

Really needed the hints, thanks.

Not a good hanjie, but I do like the final image.