Not logical :-(

The image is very cute; however, there are multiple possible solutions. I solved as much as possible using logic and then guessed my way to the end. Tip for future puzzles: some users check for logic by attempting to solve their own puzzles before they submit them.

Thank you for the puzzle!

**Solving Hints**
- All 8 squares in r1 and most of the 11 squares in r25 can be determined using logic. (Quite a bit more of the puzzle can be solved using temporaries and elimination, but it may take time.)
- The 11 squares in r25 are the bottom of a rectangular envelope that is mostly symmetrical. The 7 squares in c2 and 6 squares in c12 form the sides. The fold is v-shaped.
- The 8 squares in r1 form the top of the head, which is symmetrical r1-5 and all squares are connected to form the top half of a circle.
r3:c2,c13 ; r5:c1,c14
- The above hints should enable over 75% of the puzzle to be solved using logic.
r13:c5 ; r11:c9 ; r9:c7.

Beautiful image, but definitely difficult. If you fill in the background it makes it easier to produce without having the change as many shapes :>.

Thank you very much for the clues :)

Thanks to Strigoii for his hints! They're really useful, especially on a large puzzle such as this! Cute picture, by the way.