Check all checks and look for undefended pieces.
Here you created an undefended piece (the Queen) and the combination
rolled up with a check.
It is the wee two move tricks that win games.
Most people can see them when shown the postion, the art is knowing they
are there when you are not being shown.
I picked up the knack by playing over 1,000's of short games, which
becuase they are short ( under 25 moves) then there must be winning tactics
in them.
You learn the trick and see the situations (the patterns) it comes from.
You also pick up tons of opening ideas in every opening and ways to
step on bad developers.
I honestly saw that shot within 3 seconds of seeing the postion.
I then spent about a minute making sire that Knight does not get
trapped on e7.
I was looking for the the counter combination - the sting in the tail
that some postions hide after a combo has been played.
Train yourself to look deeper beyond the combination because often after
a combination has been played your well placed pieces will be scattered
and the piece that played a major part in the combination (in this case
the Knight) will often end up unprotected.
This is why after you have won a piece or a pawn your opponent suddenly
gets some active play till you re-coordinate your men.