M1L or M1R?

I am currently knitting a sweater for my mom.

It’s a free pattern. So, I just passed the collar and now I am going to increase but only problem is that I don’t know which increase should i do —>M1R or M1L?

I would make them lean so that they would make a [B]/ \ [/B] shape, leaning toward the raglan line. Does that make sense? Before the marker I would use a left leaning increase, after the marker a right leaning increase. HTH If not, someone else will explain it better.