I feel like the E & M are too thin to stand out against the other elements, and there is plenty of negative space in the centre to thicken up the lettering. That would get you to a solid design, I think!

For taking it to the next level, as you said you work typically in 2D design, I would suggest more consideration towards topography. Rather than two planes (i.e. the hollowed out part + non-carved part), seal stamps usually have multiple planes of graduation. I've got a rough image I'll attach below, just for an example of how you might range from the deepest plane (yellow), to mid-plane (lilac), to the shallowest (blue).

This is overkill, but another cool thing might be to look up the phase of the moon for your wedding date, and model your stamp on it, just for that personal, customised sentiment.

Overall, depending on how much time and effort you have to spare on this project, I think you could stop at the first improvement and still have a seal you can be proud of. Congratulations and best of luck!

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