Looks fine, your idea for the symbol on these thombstones was really a great one!

We know what the "one eye" on the pyramide - which is to find on the dollar note too - stands for, why so much "Stars" (bad shepherds) use this sign to communicate each other without people who never read the bible notice what's going on (Isiah 11:17) and why they're so successfully in this world (Matthew 16:26).

Your symbol with the reversed pyramide and the cross in there shows the end of this fight, the victory of the King of Kings Jesus Christ who will beat the Rulers of this lost/sinful world (Luke 4:5-7, Ephesians 6:12) for all times and that's what I LOve so much, when I see the sign for this victory on these thombstones.

Btw, here in Germany exists also a group who use this sign on their clothing when they evangelize together, so let's keep it up with this important work to rescue as much souls as we can by sharing the evangelism.