Wedding Crest

I'd love to have a wedding crest to use across all our wedding stationary. 

I'm planning to design it myself - at the moment I have this:

Luckily both J and my surnames begin with F, making the design easier to work with (and I'll be taking on J's surname anyway).

I think it's a bit too simple at the moment, definitely needs a lot more work.

Some beautiful wedding crests I've come across:

crest from here

crest from here

crest from here

crest from here