Repeating 8x8 shapes will make it take up less tile memory on NES as long as the repeated shapes are aligned to an 8x8 grid. On NES Maker specifically, this applies to title screens (which this is), but not necessarily gameplay scenes.
Here's a GIF I made on NES restrictions.
I recommend my program
I-CHR for quickly checking if an image is NES background compatible. (It only takes PNG, though. Not GIF.) I've attached a ROM of your WIP made with it. You're using 213 of the 256 tiles currently.
It's very good work! I really like teal statues you have directly above the text. One note: You don't benefit from flipping (even for 8x8 tiles) for the background. So the figure on the right and left can be asymmetrical and it won't make the tile count higher.
Edit: One more note. Repeating only helps if the tiles are exactly aligned on an 8x8 grid. For instance, the 'S' in "CURSE" and the 'S' in "PHARMAKOS" are using unique tiles because they aren't aligned to the grid in the same way. It doesn't matter now, but if you happen to run out of tiles it can be a way to save space.
Here's the a portion of the logo with the grid: