Your runningbacks are starting to look a little risky when it comes to the Chris Johnson holdout and Jahvid Best's injury history. They happen to be two of the most explosive backs in the NFL, so as long as they are on the field you are okay. I see that you have Jerome Harrison to handcuff Jahvid Best, so I'm sure you're away of all of this.
As far as wide receivers go, Calvin Johnson, Jeremy Maclin and Austin Collie is a very solid trio in .5 PPR in a twelve team league. It seems Johnny Knox is working the way out of the dog house, so that can only add to his value.
I think you drafted well. My biggest concern is your wide receivers after your top two. Sidney Rice's new situation in Seattle isn't great, and you could say the same about Steve Smith with a rookie quarterback. Vincent Jackson and Dez Bryant are solid options, but they most likely won't net too many receptions because they are offenses that spread the ball around. I'd like to have a little more depth behind them, but I wouldn't be too worried because you have talented running backs and are good at QB/TE