Do you only work arms in the gym or do you do the rest of your body as well? If you try to lose fat to make your arms defined you might be disappointed if you aren't also doing lifts for the rest of the body.
I would recommend that you find a lifting routine created by a professional. I guarantee you will have more success than trying to make one up on your own. If you are serious about lifting then you definitely need to be doing more barbell/dumbbell lifts rather than machines. Bench press will get you miles ahead of doing isolation exercises like cable extensions. The key to getting bigger is being able to push yourself. With exercises like bench/military press, you are going to be able to add weight to the bar on a frequent basis. With exercises like cable extensions, you probably are going to find it hard to get stronger and push yourself to do more every week.
If you have been consistently losing fat since you started your diet/cardio, then I would keep doing what you are doing and hope that it continues. There are really only 2 ways to lose fat, cut it off with a sharp knife (not recommended) or do use more calories than you consume. If your fat loss slows, then an increase in the amount of cardio could be in order.
Of course, the type of cardio you are doing also is a big factor. If you are running, you could try swimming or HIIT. If you haven't heard of HIIT, it is what most people recommend for fat loss. I don't personally do it but I am not trying to lose weight. I would if I was. Also if you tell me that you are one of those guys that only works arms out and has no intention of lifting for the entire rest of your body, then I can't really help you any further cause unless you lift for your entire body you're never really going to be satisfied. Also can you be more specific about your diet? Do you know approximately how much protein you consume per day?
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