Masculine 16th Birthday

I'm interrupting our normal Mother's Day card "programming" with a masculine birthday card I made for a former coworker to give to her son. I'm hoping that this card isn't too juvenile for a 16-year-old's bday.....

My husband's critique isn't trustworthy (he was hesitant) so I'm open to feedback!

P.S. For those interested, I switched the picture in my last post to the final project.

{Supplies--all Papertrey Ink unless noted}

• Cardstock: Enchanted Evening, Stamper's Select White, Summer Sunrise
• Patterned Paper: By the Numbers
• Stamps: Simple Sentiments
• Ink: Memento Tuxedo Black (Tsukineko), Spiced Marmalade Tim Holtz Distress Ink (Ranger)
• Dies: By the Numbers, Seeing Stars
• Other Tools: corrugated cardboard, By the Numbers impression plate, Diamond Plate Cuttlebug embossing folder (Provo Craft)