Too much for your biceps, and not enough variety.
I'd strongly urge you to do biceps only one day a week, and add triceps to that other day, just triceps.
For biceps, add wide grip straight bar curls to target the brachii, which will both thicken your arm and push the biceps up to help give shape to the peak.
For tri's, in addition to push downs and dips, do straight bar behind the head seated extensions, with a medium close grip, as well as the following exercise for the long head that will truly give you a deep thick sweep, here's how it works:
place a flat bench perpendicular between a cable cross-over slightly more than half way. Lower the cable guide to 3/4 of the way down the rail and use a rope attachment.
Face down, knees on the ground, feet behind you and elbows resting on the bench in front of you, pull the cable from behind your head forward - a laying tricep extension. Keep your stomach tucked and your head down and your butt pulled down as far as possible. Get a full extension and nail it there, then as you release back slowly get a full bend and stretch that long head, really push your core down and feel that stretch, even flex your biceps, then press again.
Work this into your routine and within four to six weeks you'll see your arms thicken, trust me.