Congrats on the bonus alternate art! I don't think it is intended to be a complete set, but I'm not sure.
1) Resolute Aura gives the tough -2 to all creatures but it only gives the armor to the creatures that are NOT the Paladin. To put it another way, all friendly creatures in the zone gain both of the Aura's benefits except for the Paladin who only gets the Tough -2
2) Only one Terrain conjuration may occupy a zone at a time. Most terrain is Iindestructible and can only be removed by replacing it with a different terrain. In order to do this you must pay the cost in mana of the terrain that you are replacing in addition to the cost of the terrain that you wish to place in that zone. In the rules example, the Shallow Sea (a terrain) has a whirlpool (Not a terrain) attached to it. The whirlpool increases the cost to replace the shallow sea by its own mana cost. The replacing terrain is elephant grass.
Hope that helps!