YM lugs should definitely be more rounded than Sub, GMT, etc. But the case side profile should be a bit rounded, sort of like a DJ, compared to Sub, GMt, SD, which is very flat, vertical, slabby. Maybe yours is, but it doesn't look like it in the pic.
Bracelet looks to thick too me. Polishing of centrelinks also looks poor, very wavy reflections.
Index borders look too thick.
I'm definitely not a Rolex pro, I didn't even know the YM uses different hands to the other sports model (apart from the red seconds hand of course). That's why I asked, didn't claim it as certainly fake. You should be able to tell in real life - polished 904L looks different to polished 316L steel.
If in doubt, ask an AD.