Hi Mommajo,
They are most probably too big. I try and make mine about 1.4mb - if you see when you are trying to download they have a number highlighted in red for the size of it. Sorry I can't remember what it is and I always go by megabytes. Someone will come along shortly and tell you the correct details. Love and blessings Chris
P.S. Just went and had a look and they are to be no more than 3072kb - jpeg or gif are best.