A positional game

Not a perfect game, nonetheless:

Find a strong move for Black. The question to ask is: What is White's plan? How do we prevent it?

Continuing with the game:

Find the ideal plan for White.

Hint: Which pieces can be improved.
Bonus: What is the long term idea? There's a problem with Black's position, find it!

Try to figure this out before moving on to the next diagram: