I just put a few pats of butter on top of the salmon, seasoning: onion salt, salt, black pepper, dill. You have to soak the wood plank (submerge in water) for at least 20 minutes. Put it on the grill for about 20-25 minutes. add some lemon if desired. (The plank will burn on the bottom- that's ok)
The composition could do with a different arrangement I feel, in particular, the bottles and glasses are fairly rigidly lined up which takes away a little from the feeling of informality. I also wonder whether a lower perspective would make for a stronger image.