Characters

They are for a new story im working on.... and also for practising distinct features on the characters, so they wont have the same face, from left to right and from top to botton:
1- Harley Gaffney: a shy and friendly railroad engineer from London (with Irish ancestry) ,he works on a steam machine that he named affectionately "The speed voyager"
2- Serge Nikolai :Strong Russian Worker (tough we dont know his workplace) ,he's often calm and laidback and doesnt get angry easily, but when he does it is better to run
3- ??? cantthinkofanameyet: A very competent railroad engineer that is also really clever , has aversion to silver
4- Willhem D. Cassidy : Old Professor whos a half-vampire as a result of his mother being bitten by a vampire, and then vampirized when she was pregnant , Willhem is really serious and disciplined
5- Doctor Kenneth Gaffney: Harley's younger brother, he is studying medicine and is much more extroverted than his older brother
6-Robert "Bobby" Parker : Canadian-American young man.
aside from the characters flatness (i need to work on them!) what do you think? did i fail or did i pass on giving them distinct features?