I concider biceps as one of my best, fastest growing muscles ("hitting" biceps with weights, strands, kettlebells, etc since my childhood takes it part there). It´s not that big (I didn´t do measurements... I´m small person - I started workouts as scrawniest kid of my neighbourhood, my dad is scawny too, so genetics have it´s part there for sure), but if I would pick my best muscle, it will be biceps.
Some ideas that worked for me (I would assume You are working out with strands, so ideas are adjusted to that):
If You could, add chin ups and pull ups to Your routine. Few sets every other day (or twice a week) would be enough. With chin ups, end last set with a few seconds isometric hold (static chin up hold) within motion. I am sort of fan of armwrestling sport figures - if they have one thing in common in workout, that are isometric chin up holds. From my experience - I have better development of biceps if I do that ocasionall chin ups nad pull ups than if I do only strand work.
Even if You coldn´t do one rep, strart it (weeks ago, I could perform one chin up... so I did few sets like 5 days a week ... no I could do 3-6 pull ups/chin ups for few sets, I do them usually now two times a week).
As far of strands: straight arm work is great. Gymnasts, which put a lot of work to straight arm holds have significant biceps development (and in most of cases - they don´t work biceps with strandard biceps excercises, but biceps development its secondary effect of their´s straight arm excercises). Excercises like ODP (hands facing in and out - use both variations), archer´s pull (straight, supported arm) and another excercises that demand Your arm(s) to be in straight position and resist strain from diffenent angles have effect on biceps.
I couldn´t reccomend more standard biceps excercises - biceps curls (my nearly always excercise in full body workouts), reverse biceps curl (really great for back side of forearms and lover head of biceps).
... When I do biceps curls, I end up with isometric hold on top of movement in last rep of every set (I count to 5 usually). That gets another pump.
Try slow reps, quick reps, half reps, etc... ("different things affect different people differently" ) With biceps excercises, I do minimum of 8 reps, but mostly 12-15 reps with 3 sets.
And my-o-reps concept (see last topics) would be really good for biceps development I think.
Rows are good also (i do seated variation).
Wrist curls is also excercise that engage biceps in some way.
Hope that will help.
If You are interested in my rep scheme from my dumbbell home workout from past (I had greater development of biceps then), let me know.
As always, sorry for bad english.