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Just as Tim T stated, you need to use cornerbead, dovetailing each metal edge into the corner. In addition, you need to apply texture with premixed joint compound using an 18 inch to 24 inch blade/trowel (the longer the better) consistent with the texture type/design of your other walls, filling in the gap/elevation difference between the drywall and the elevated metal bead edge (the elevated bead becomes the hard outside edge of each piece of drywall. Apply joint compound to the three piece outside corner in the approximate desired shape with a small trowel/blade. Allow the joint compound to dry. Sand and reapply more as needed. Let dry, again, and final sand.
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