Did First Vision story Evolve from Just Angels to Seeing God? Actually, No.

In all four accounts authored by Joseph Smith, he clearly stated that Jesus Christ was present. In the 1835 account, he briefly mentions that angels were also present besides the Father and the Son.

There are also two brief notes by a scribe stating that Joseph told someone on other occasions about a time he was visited by an angel.  We are not sure that Joseph was even talking about the First Vision on those occasions, or if he was, whether Joseph said that he was visited by a heavenly personage and the scribe recorded in his notes the word “angel,” or whether Joseph mentioned the angels that were also present and this is all the scribe heard or wrote down.  In short, the two-sentence accounts by a third person are not detailed enough to provide any real basis for saying that Joseph did not know that God was present in the vision.  Joseph recorded enough accounts himself, and these are where the focus rightly belongs.

For more information see: https://www.lds.org/topics/first-vision-accounts?lang=eng