Hey girl,, about this size limit thing.. maybe you could try saving them a .jpg instead of a .png file?

file formats alone can effect the file size... for example if you save something as .jpg and then save it as a .bmp... the .bmp file is HUGE compaired to the .jpg file.. i dont see any difference in quialty inbtween a .jpg and a .bmp but it sure does effect the file size.
i do know that resizing pictures/siggy effects the quailty though.