Bicep shape is largely genetic. Some have long full biceps, some have short peaked biceps. It has more to do with genetics and where your biceps attaches at the forearm.
I have one of each now due to a bicep tendon rupture. I always had long full biceps with peak but not a really high peak. My left bicep tendon tore off completely from my forearm. When it was reattached, it made my left bicep shorter and higher than my right. I notice it even though nobody else seems to.
The one thing that has not been mentioned is working the underlying muscles buried beneath the biceps: the brachias and the brachial radialas.
These work when the hand is sideways and palms down. For the most part, they sit UNDER the bicep. When fully developed, they lift up the bicep like a cat under a carpet. To work them, do tons of hammer curls ( palms sideways or faced in like holding a hammer) and reverse curls (palms faced down). As they get bigger, they lift up the biceps and make them look bigger. Look at any pic of a body builder and you will see the bulge on the side between the bi's and tri's.
Fortunately, I always worked them so when my bicep was completely detached, they were still strong enough to allow me to curl a weight heavy enough to fool my primary physician that my bicep must still have been attached. He told me that my bicep must still be attached and only stretched when later tests showed it was completely detached and not doing any lifting. It was all brachias and brachial radialis.
Build those two muscles and your peak will definitely grow and show.