I am a first timer as well, but from the looks of it the plant is stretching, your lights may be too far away. The shorter the nodes are the tighter the buds will be in the end. Other than that it looks very nice. I do believe it's sativa dominant.
Actually, I would add additional lighting along the sides of the plant as well to help fill out those areas and get good enough light penetration for the sweet buds growing in the middle and at the bottom.