You can post images up to 500 kb the second one of yours is 16. If you have the original you need to increase the resolution to about 600 dpi. If your scanner does not have a pre-scan which allows you to only scan a portion, then scan the whole of the picture and then use something like Paint to select just the area you need.
You highlight it in a rectangle, press C (copy); then New and then Ctrl V (paste) and save the new image as a new name.
Ken