@beehove_me: if this works for you than you are fine coz there isn't anything like perfect routine that will work for everyone... Still couple of suggestions...

1. If you workout 4 days a week I would recommend to workout on monday, wednesday, friday and saturday.
2. Don't do abs everyday, twice a week should be enough.
3. If I was you I would do
Day1: CHEST & TRICEPS
Day2: REST
Day3: SHOULDER & ABS
Day4: REST
Day5: BACK & BICEPS
Day6: QUADS & ABS
Day7: REST
4. Do more compound exercises and less isolation (for beginners and intermediate bodybuilder its not even required)
5. Keep in mind that Triceps and Biceps are small muscle group unlike chest and back. Also your biceps and triceps get worked out when you are doing chest and back. I do 2 different exercise of 4 sets for triceps and biceps. Biceps (either barbell curl or dumbbell curl X 4 AND Preacher curl or concentration curl or incline dumbbell press X 4). Triceps (close grip bench press X 4 AND lying triceps extension or overhead lateral triceps extension X 4). To be honest doing less has worked better for me.