2 Questions...

hallo, i would train the traps with dumbles. do 4 sets with 10-20 reps. one workout do 10-15 reps and the ohter workout do 15-20 reps do this 2times a weeks. lift the weight and hold the position for 2 sec than down the shoulders and repeat this

your bicep and tricep programm is good. for gain maybe you need more good food...
stay fit

I have a different perspective from most people on this site because I follow a training system which combines bodybuilding as we know it with dual factor training theory which is closest to competitive sports training e.g. olympic weightlifting, powerlifting, sprinting etc. To get results on most muscle groups as a beginner you need to train them more than once a week. I do traps 3 times week. Trust me, that as a beginner you can handle that much workload because your weights are not heavy and you can recover fast. If you feel like your traps arent recovering fast then do 1 heavy day, one medium day and one light day - Soreness isnt an indicator of whether you've recovered or not - the amount of weight you can handle is. Here's a tip: use lower reps for barbell moves and high reps for dumbbell moves. The traps are a diverse muscle group and needs both heavy weights and volume to grow. So here's what I do:

3 - 4 Sets of barbell shrugs pyramided:
165 x 10, 185 x 8, 205 x 6 one back off set of 165 till failure

Then I do 3 - 4 sets of dumbbell shrugs
70 x 15, 75 x 13, 80 x 11 one back off set of 65 till failure

Trust me that traps need a volume of 10-15 to grow! But go heavy on them too! If you do choose to hit them just once a week.... just add another 3-4 sets to your routine... This is the most important thing though - Your weights have to be constantly moving UP. If you're not using more weight eventually you're not gonna grow. Thats the reason why I train each muscle group 2 - 3 times a week, to keep the nervous system in response to make those weights go up. Anyway, have fun!

About 3 years ago, I was in your position. I have always been skinny as hell... then I joined up with this site & i've grown alot since.

You're trying to get big, so you have to train big. You have to do everything big - eat big, sleep long, lift big & heavy. There's no other way!

I like the fact that you're doing arms just once a week. I don't know if you realize, but you're also doing a bit of arms when doing push & pull movements as well.

This is what I do for traps (don't know if it will work for you) - After my chest workout, I do 4 sets of heavy shrugs holding each rep at the top for 8-12 reps. I then do heavy barbell upright rows, 4 sets of 10 reps. The most important thing to remember is to get as least 2 minutes rest between sets. I take 4 minutes when bulking.

Now because you're working arms more than you realize, i'd recommend that you do less than what you've said in your routine. Yours is a good routine, but it's too much for what you're trying to accomplish. Why don't you try doing this -
4 sets 6-8 ez curls
4 sets 6-8 standing hammer curls
4 sets 10 lying head busters
4 sets 8-10 standing tricep presses
3 sets 8 reverse triceps

Your triceps consists of 3 different heads & your biceps only have two. So you need to work your tris more to make them look bigger. When you're bulking, you have to bulk. There's no in between... I had to learn this the hard way too!

Let me know what you think & if this helps bro. Good luck!