Good variation in designs. Did you finish gluing and mounting? If so can you repost the final images and photograph in good light so we can see the contrast between black and white spaces (your first 2 photos are good). The last 2 designs have too much white space and need more black line interaction.
Design 3:
Maybe add one more fiddle head curve and just increase the spiral shape (make it bigger), then you have 3 instead of 2 shapes. Perhaps overlap 2 spirals.
Design 4:
I like the small to large hatched line shapes but again perhaps a scale change of REALLY large cropped one at the bottom would make the small one more impactful.
Good variation in designs. Did you finish gluing and mounting? If so can you repost the final images and photograph in good light so we can see the contrast between black and white spaces (your first 2 photos are good). The last 2 designs have too much white space and need more black line interaction.
Design 3:
Maybe add one more fiddle head curve and just increase the spiral shape (make it bigger), then you have 3 instead of 2 shapes. Perhaps overlap 2 spirals.
Design 4:
I like the small to large hatched line shapes but again perhaps a scale change of REALLY large cropped one at the bottom would make the small one more impactful.