The raven guard needs far less white; usually just the helmet and one shoulder pad makes it work. Generally the arms only white for captains and veterans in fluff terms, but practically it only looks good on lightning claws. The legs are always black.
The raptor just needs a more olive green shade instead because it looks like a dark angel right now (the double plasma doesn't help either

)
That being said, you're solid at painting and the spacewolf looks great