Identification aids assume a specimen can be examined from different aspects, so please provide photographs of several views if seeking identification.
SNAILS: straight on views of aperture with animal withdrawn. profile, umbilicus (if present) and apex are most useful. (You may need to prod with grass or fine brush to get it to withdraw).
LAND SLUGS: right side with pneumostome (breathing hole), dorsal view and, if possible, sole seen through glass. (Some require dissection.)
BIVALVES: straight on views of both exterior and interior of shell and hinge teeth. For North Atlantic marine bivalve species see naturalhistory.museumwales.ac.uk/BritishBivalves/home.php?
For museum or scientific publication standard views download the pdf at www.researchgate.net/publication/331044326_Standard_views…

If you are interested in non-marine mollusc species that live in Europe and agree to post well posed images if for identification, you may like to join www.facebook.com/groups/LaFMoll
DITTO for marine species www.facebook.com/groups/british.marine.mollusca [Not for trade. If not resident in Europe please explain why you wish to join either group]