Hey, like BlueDagger said, welcome to the board.
Also, like BlueDagger said, your list is a negative. What you have is a collection of models, not a competitive army. They'll look cool on the board, but that's about it

.
Redundancy is the name of the game here. Your army has campers (pathfinders, technically the wraithlords will sit back and shoot as well), fast movers (
DA's in serpents, striking scorpions--only if you give them shadowstrike, banshees), and slow movers (Avatar, and the scorpions without shadowstrike). Is this all that you actually own? Maybe give us a list of everything you own and what you're wiling to buy, then we can help from there. Your list as it stands now is so off-beat that there's nowhere to really go with it.