Sea Lord @ 559 Pts
Halberd; Dragon Armour
Master of the Mists
Loremasters Cloak
Reaver Bow
Dragonscale Shield
Pure of Heart
A few problems.
The Halbred is two-handed, which makes it impossible to use with a shield, which you have invested point it. Or is this just for shooting? If so, hy not go with the a Greatweapon? This guy will kill anything on a charge, so you won't have to worry about striking last anyway. A lance might be even better.
And you can only ever take one magical weapon, so no sword of striking or such with the reaver bow, which is a shame, because it could be really nice on this guy.
You seem like you can't decide what this guy should do; shoot and get shot at, or handle heavy fighting... If you want him to be a shooter you should give him GW, the shield, cloak, armour and bow, andsit him on an eagel, and save the points. If you really want to use the dragon's offensive capabilities, you should arm to match, with the Vambraces instead of cloak, and lance or GW instead of halbred.