The donk lead is ok in hand one but I'd bet bigger if I was going to donk, as others have said. As played your river bet is way too big.

In hand two calling or raising the flop is probably awash. Heads-up raising is probably almost always best, but here his hand rates to be stronger when donking into 2 opponents, so you figure to get 3-bet by a set more often, and there's also value in keeping the third player in the pot. Although, a raise looks much stronger here and you figure to get folds out of his weaker hands more often, so whatever, take your pick.

Fold preflop in the third hand. These plays are fairly pointless and probably have close to zero expectation.