I have no mind's eye when I pray. I open my soul to God, and that is the main point.
I think I tend to lift my head/face up when I pray, but it is more out of the feeling that something so wonderfully uncontainable is trying to burst out than anything else.
What a really brilliant question. I've never really thought about it. I actually had to close my eyes and say a prayer to see . . . I intuitively focus on my heartspace when I pray. Thank you for asking.