I had a guy ask me for advice after a social doubles match...they were all 3.5s so compared to them, they though I all played college tennis.
He was very grateful for the advice, but Ive learned to never give it unless offered.
I told him with his grip, he was never going to be able to hit the kind of shots he wanted. Thats a long road, though.
But the main things I see are wrong grip, lack of footwork, poor shoulder turn.