Usher's Son First Photo After Horrific Pool Accident

8/8/2013 3:23 PM PDT

's ex-wife is clearly trying to prove a point ... she's a caring mother who deserves custody of their sons -- after the eldest nearly drowned this week -- and this photo tells the story.

Tameka Raymond posted the photo today, the first pic of 5-year-old Usher Raymond V since the horrific accident on Monday ... and it paints a picture of motherly love and protection. Tameka's arms are wrapped around her son, and he's surrounded by get-well-soon balloons.

It's a subtle dig at Usher ... who is noticeably absent.

As we reported, Tameka is blaming Usher for the pool accident, claiming he isn't an attentive father -- despite having primary custody of their two boys -- and she's already filed legal docs attempting to get custody back.