Hello Rizon,

I just made a signature for my profile. It is only 360 by 100 pixels, but it's way larger than 9kb. (about 100). In my opinion, the limits of the size of the pictures is just unreasonable. A picture smaller than 9kb would be about 3 by 3 cm's.. or even less.
So my suggestion would be that the size of the pictures would be increased to about 100 kb.

Hope to hear from you guys!