Which of the following graphs (see attached) is not isomorphic to the others, and why?

All graphs have 5 nodes

All graphs have 6 arcs

All graphs have 2 nodes of degree 3 and 3 nodes of degree 2

No graph has parallel arcs

No graphs have a loop

All graphs have a cycle

No graph is complete

What other characteristics can I look for to prove that one of these 5 graphs is not isomorphic?

(Also sorry for the bad paintbrush skills)