If I continue to do this..........

and keep a 300-500cal/day deficit , do you think I will slowly lose a bit, and more quickly build muscle/tone my upper body?

I am not aiming to crash diet into a particular weight, just want to have an slow maintainable weight loss and good health!

Arm Dumbell Row: 3 sets of 10 w/ 25 lbs

Skullcrushers: 3 sets os 8 reps w/ 25 lbs

Easy Bar Curls: 3 sets of 10 reps w/ 30 lbs

Lat Pulldowns: (underhand close grip) 3 sets of 8 reps w/ 50 lbs

Hammer Curls: 3 sets of 8 reps w/ 20 lbs

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I follow this up with 30-35 minutes of cardio- 2 times a week.

I do an additional day or two of 30-35 min cardio.

Building muscle and loosing weight are two orthogonal things. I think the best you can hope for is not too loose muscle mass. Which is a very common thing when people try to loose weight.

Those are good.  Throw in some pushups (kneeling or regular), some negative pullups, military press, and tricep dips.

Kneeling pushups are a good warmup.

Move the weights as slowly as possible to avoid momentum.