Is this Back + Biceps OK?

My gym is pretty limited with no barbell apart from an EZ curl bar and smith machine and dumbells that go up to 50 lb / ~25kg
 
I've started doing this for back and biceps on the same day, what do you think and how could I improve it with limited tools:
 
Wide grip palms facing out pull ups: 3x8
 
Close grip palms facing in pull downs on the lat pull down machine: 3x8
 
Seated cable rows, close grip: 3x8
 
EZ bar biceps curls: 3x8
 
I used to do dumbbell rows but the DBs are too light now.  I can't really do bent over rows in the smith machine either. I find the above quite challenging and hope the different grips: wide grip, close grip & hammer type grip on the seated cable rows hits different parts of my back.
 
What else do or what could I change?
 
Thanks!

Looks fine to me mate.Some people will be enraged at the lack of deadlifting in your routine but I haven't done deads for years cos of lower back pain and it doesn't seem to have hindered me.You know what I'm going to say though-a gym which only has 25kg dumbells is pretty crap really.Find a new gym is the best advice.

I wish I could do deads but this gym, as you say, is pretty crap.
 
Upside is it is a short lift ride away and is free. Can't beat that.