I'd add more defences to your goblin warboss, light armour isn't enought to protect your army general, I'd add some magic armour to protect him. I'm also not sure that you're allowed to give a lord a magic banner and even if you are, the spider banner directly states it may only be taken by a standard bearer. But no big deal, you can give it to a big boss and make him your bsb. This will also allow you to better equip your warboss. Perhaps a magic weapon and the crown of command? I'd also consider making the Orcs, big uns because then they'll put out even more damage against weaker enemies such as high elf spearmen and also be able to handle themselves against tougher enemies like saraus. I might also consider a unit of 30 instead of 20 to give your opponent an even bigger problem. The forest goblins spider riders are good war machine hunters but don't really need a champion or a standard. Hope this helps and good luck in the tournament
"I'm gonna stomp 'em to dust. I'm gonna grind their bones. I'm gonna pile 'em up inna big fire and roast 'em. I'm gonna bash 'eads, break faces and jump up and down on da bits dat are left. An' den I'm gonna get really mean."