Before you save an image...you need to make sure that you have opened it as large as it will go. Double click on the image in photobucket or in someones shared file to open it up. Then make sure that it is opened up 100%. If you wave the mouse towards the top left corner of the picture in some of the websites you will see a tab that says full size and below that 80%...click on the full size tab so that it is opened up as large as possible. Then copy the picture and paste it into your "my pictures" on your desktop. From there you can use the picture in Word, Photoshop or whatever program you have.
If the current pictures you are opening up are very small...they will just distort when you try to increase the size.
Hope this helps! Dolly