The orans position is the ancient Eastern Christian form that was used by monastics and also by laity.
Symbolically, when we stretch out our hands, palms upward, we are asking God to pour upon us the Holy Oil of His Divine Mercy. St Seraphim and others prayed constantly this way. I find it to be a position that really helps one focus on prayer.
(When I’m in a Latini Catholic parish, I bring my hands together, thumbs crossed in the RC position- this is a great way to aid one’s concentration in prayer as well and brings me to heart-felt tears!)
It is good to lift up one’s hands for the Our Father, but without making a show of it, slightly extending one’s hands, palms upward.
If we are doing it to show off, it is better to refrain . . .
Alex