Most people are looking at Instagram on their phones, so staging an artsy shot where your sneakers are off in the distance isn't going to help things. Yeah, it's cool when done for the web, but if there's a bunch of crap in your picture AND the background is more in focus than your sneakers, you're failing, bro. Keep it simple and keep the blur tactics to the stuff that's off in the distance. Otherwise, nobody is going to be able to tell what kind of kicks they are, let alone like them.
Make Sure Your Kicks Are Your Focal Point