Need Help - Correct Suit Sleeve Length

I need some help here. Could someone post a picture depicting the correct sleeve length of a suit coat? I'm primarily concerned with the wrist, the shirt cuff, and the end of the jacket sleeve when standing with one's arms hanging at one's sides. I'm having a hard time getting any of my shirt cuff to show and yet my tailor tells me my suit jacket sleeves are the correct length. I don't believe my shirt sleeves are too short as when I bend my arms the cuffs don't pull back. Any help/suggestions would be appreciated.

Thanks.