Interesting move.
Positionally sound, as it does block the pawn but I would have brought some power to da party by developing another piece instead.
Your Queen's knight is idle and bringing it to B3 would have covered K4, (K2, Q5, Qkn5 and Qr4 as well)
As it is, the bishop has removed one of the pawns attackers by occlusion, (The rook).

You have now invested 2 moves in that bishop, so If I were to force a trade with a black bishop or knight that has only moved once, it will cost white even more tempo.

Remember, it's about time more than space.

B - Q2

Gets my bishop off the back rank, double-covers my knight, and allows casteling to either side, which will link my rooks.

Black is now approximately 3 moves ahead of white and down a pawn.

No worry about takin' your time to move, but you gotta quit giving tempo away.

Run the game backwards and forwards until the concepts just jump out at ya.
(I usually take a snapshot of the board and then play both sides a few moves into the future to form a strategy and get a "feel" for the balance of forces.)

Aloha
Weeze