To make sure that your Facebook images look good, try these tips:
► Change your Facebook picture size to one of the accepted sizes.
► Upload large sized images (KB) and in order to avoid that an image be compressed when uploaded, make sure the size of the file is less than 100 kb.
▼ Save your images for Facebook as a JPEG file with a color profile of sRGB.
▸ Load high resolution images (larger quantity of pixels).
▸ Use PNG for images with text or logos.