I recently saw some drawings of the Kohen's hands during duchaning, not the way I do it. I put my two first fingers together without leaving a window. I would like to know if there is any valid way that includes putting those two fingers together. Thank you.
The first answer to Kohanic Hand Gestures? (YDK Dec 15 '10 at 0:49) gives what I believe is the normative method as I think you describe it.
The last answer (DoubleAA Nov 11 '11 at 4:38) is the custom of the Gr"A where "you spread out all the fingers".
Could it be that you saw a drawing of the postioning of the fingers according to the Gr"A?