I like the 2nd one, but if it were me I would angle the smaller rocks on the edge inwards (e.g. towards the front glass) in order to be able to clean the glass and give a little more uniqueness rather than just a straight line of rocks, but great start so far! what type of substrate is that?
And remember you don't HAVE to use all of the rock, I tried to cram all of my rock into my tank when I got it because I felt I was wasting them if they weren't in the tank... I finally decided to take ~30-40lbs out and keep it dry in a bucket for a different tank or a possible upgrade in the future. Gave it a much cleaner look and I couldn't be happier with my scape now.