100NL: Floating & repping flush

I decided to turn my hand into a bluff. I think my river bet should be a little bigger, $36. How does this look? What do you guys think about bluffing flushes in general?

$0.50/$1 No Limit Holdem
6 Players
Hand Conversion Powered by weaktight.com

Stacks:
UTG Bjoern__Borg ($165.98)
UTG+1 Hero ($101.50)
CO honzal ($153)
BTN bay_117 ($78.03)
SB Jakobi111 ($60.94)
BB mittsexan129 ($97.16)

Pre-Flop: ($1.50, 6 players) Hero is UTG+1 10 9
Bjoern__Borg raises to $3, Hero calls $3, 1 fold, bay_117 calls $3, 2 folds

Flop: 10 2 K ($10.50, 3 players)
Bjoern__Borg bets $6, Hero calls $6, bay_117 folds

Turn: 6 ($22.50, 2 players)
Bjoern__Borg checks, Hero bets $16, Bjoern__Borg calls $16

River: 4 ($54.50, 2 players)
Bjoern__Borg checks, Hero bets $28

I think its a ok spot for repping flush here, and he only check/called on turn but i really dont like bet sizing on river.

When you bet $28 into $54 pot, you are giving him to good odds to call (almost 3:1) So to make him fold i think this is spot for healthy pot sized bet or overbet.

I like to overbet nuts here once in a while so its a good spot to do it as a bluff!

I think repping flush is relatively easy, while there are still palyers who dont defend well against it, meaning they dont have flush eonough of time themselves when turning into check-calling.

In your case, I think better spot would be if you were the guy on the button since it includes more suited cards than your UTG+1 position, your sizing is also very discutable I think, and in the end there is a question if you should go repping at all, and bet the turn while you have second pair which will be good enough decent amount of time if you check, check.