Blunderland: A place to find joy in learning from mistakes (ELO 500 and lower)

I would like to create a place for true beginners to learn how to learn from mistakes, so since it's the holiday season for many, I thought "Blunderland" might fit the theme.

My idea:  

1.  Post a single snapshot in a game.

2.  Describe what you feel is going well

3.  Describe what you think isn't

4.  Ask a question, if needed, to see if folks with more experience might respond

So, here is my first go of this.

1.  Here's my pic:

2.   It took 74 games for me to realize that I had no "Theory of Mind" for my opponents play.  Since considering this more in the last couple of days, my blunders have gone down.  I also think my position is relatively strong in this game, despite only being up one piece.  

3.  When I reviewed the game, I 100% did not see the free bishop, but even if I did, as a newbie, I wouldn't know whether to risk losing my position to take it.  I liked that my bishop and queen are lined up on the diagonal directed toward the opponents king, I like that my pieces are fairly protected, and  I like dark squared bishop's position.

Question:  When you have a strategy, as rudimentary as this one is for me, when should you leave a strategic position to take a free piece?   If you wanted to play a positional game, what would you do in this situation?