Blending somewhat isn't the worst thing in the world. Summer is a time for lower contrast looks (especially if you're throwing a light colored jacket in the mix), because the increased light increases contrast as is- that's why dark, contrasty winter looks come off as much more severe in sun, and why night time dress is starker- you need greater contrast in elements in the dimmer light to keep things distinct.
I'm a firm believer in the idea that a tie should be darker than the shirt. It's not an absolute rule, but I find that I very rarely see a look I like that doesn't meet that standard. And maybe it's just the photo, but that comes off as an extremely light tie. It resolves to a pretty pale color as a whole. Think about it like you would a light silver tie, or a yellow one. The optimal pairing is with a shirt that at least has a white ground. Very light blues could work, but honestly be afraid of the shirt being too dark. Again, maybe it's just the photo and I'm overreacting, but I think white is safer.
Just for a visual, this is about what we're talking about. Sorry for the lousy photo, it's just stolen off of google.