The minimum standard for the picture size of QQ space signature file is:

1, the picture with space size should be regular, and the size is 540px *160px; (px stands for pixels, with a length of 540 pixels and a height of 160 pixels)

2. First try to upload a QQ space photo album and then call it a picture;

3. Sometimes QQ space can't be displayed because of cache, just refresh it several times;

The above is my answer, I hope I can help you!