For 17 yrs old man you look awesome, no doubt.
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My first piece of advice would be this: Seeing as we can't see your legs, I'm assuming you probably don't train them. or train them that hard. I've been lifting since I was about 16 or 17 and trust me when I say.. SQUAT. Train your legs HARD and your upperbody will grow. It sounds stupid, but trust me the more you squat the bigger your upperbody will get. Also, Do NOT neglect your deadlifts. They will put quality mass on your back, legs, arms, and shoulders / traps... Those two movements will help you gain more quality mass and power than any other isolation exercise.
As far as for chest, focus on incline presses at a slight incline (25 degrees) as opposed to the original 45 degree incline. This will make your chest look much much bigger, no doubt.
Also- One last thing. You seem pretty lean man. It will be hard to pack on lbs staying that lean.. I'm not saying get sloppy fat, but eat more food, and try to gain a little bit of body fat.. Trying to be perpetually lean year round will not help you gain mass. It will only hinder your strength and size gains.
As a general rule of thumb- dont get too fat or it ****s with your hormones. If you can still see the outline of your abs (not flexing) you're fine.