I like the mouth symbols in sequence without the head symbols for each one - a nice economical idea :)
I don't think it looks silly - why would it? I think whatever different communities choose to write is great - and nothing is silly.  With time the choices become conventional for each community.   Every sign language is unique and in the same way it will be wonderful to study the different choices made for writing and encoding the different language using SignWriting.. :)
maria