Can you help me finding a big picture of jack from a nightmare before christmas?

i'd like to print it out on several a4... then mounting it on cardstock and let it hang from my door!^^

i've found many of them but nothing big enough

Try searching for Nightmare Before Christmas wallpapers. You would probably find one with a large graphic of Jack that you can crop to then print on multiple sheets to put together as a large poster.

Microsoft Paint can print a graphic across multiple pages that can be assembled to make a large poster.
Choose Print > Page Set Up and then Fit To:. The first box is the width and the second is the height in number of pages. Make sure you have Portrait or Landscape orientation selected and your page size, A4. Make sure All Pages is selected when you print.

The result is usually OK, depending on how big the original is before you expand it. I have a virtual pdf printer driver installed so I can output to a pdf. That lets me see the quality of the finished product before using ink to print.