Cochins are a very slow maturing breed. That bird doesn't even have all its adult plumage yet, which means there is no way to tell its sex by its feathers. My LF Cochin boys looked just like your during their gangly teenage phase. And they didn't look like men (with their stringy sickles and hackles) until around 5 or 6 months old.
For what its worth, both sexes start out with nubs where the spurs are located. Rooster spurs aren't full grown until they're nearly a year old, quite some time after they're sexually mature. You'll see dancing and mounting before you see spurs, is what I'm trying to say.
Here's one way to tell the sex of your Cochin by its feathers....
Take a look at those wings, they're much darker than the rest of its feathers. Females, in buff, red and partridge are an even color all over (normally, sometimes they can be smutty). When he goes thru his next juvenile moult and grows in his adult plumage, I'd be willing to bet he'll show you alot more beautiful, shiny red. Especially on his neck and before his tail.
If you look thru the pictures on my profile page there are tons of picture of my cochins. My girls have combs of varying sizes and there are pictures of my roosters at various stages of maturity. Take a look at them and then decide how you feel about your cochin. Good luck