Crayfish for species ID

Another cartoony crayfish drawing for my 'crayfish information for kids' pamphlet. This one will be used to show the two species common here. The image will replicated and each will have different markings added to show the key species differences.

Usually color markings are not the best way to differentiate crayfish species, especially back home in the USA where many of the 400+ species look very similar.

the deadline approaches!