What is your standard pf raise? Id make it atleast $0.50 here, maybe up to $.75. On the flop there is $1.80 in the pot, and 3 others in it with you. The flop brings two overs and a flush draw, this is not a good flop to cbet, especially in a multiway pot. If you are going to cbet, you need to make it more than your bet [which was less than half the pot], Id say between 2/3 and 3/4, but I still dont think you should be betting here OOP. I check/fold this flop, in position you can play it a little more aggressively though.