OK, I'll try and make myself more limpid:
1. Right side of the 4th digit: on this photo, the line is a perfect arc of oval, with the edges of the line slightly darker, just like when one uses a brush the paint is a bit thicker at the edges of the brush stroke. This means the digit is either a '0' or a '9', a '0' being more probable since a '9' would usually have a wider top:
2. Left side of the digit: even though the images are not sharp, they seem to show that the left side is continuous over the lower 2/3 of the left line, thus excluding a '9':
Consequently, there only remains the possibility of a '0'.
Michel