Yeah, hiding something so significant is completely unfair to your partner - unless you are using this job to save up the money to leave. It's pretty unfair to keep something SO big a secret from the person you're supposed to be sharing your life with. I'm not a fan of keeping any secrets in a marriage, but something this big... That's pretty bad. Not only can the job end up affecting your partner's life when they find out - it can have consequences on them, such as if you ever get a stalker or blackmail attempts (big secrets like this are incredible material for blackmailers), gossip from friends and family and coworkers, any potential affect on your sex life - but now they know that you are capable of leading a secret life without a qualm and that would be heart-breaking. If I found out something like that, I'd get a divorce in a heartbeat because I don't want to be married to a liar. It's incredibly unfair to put your partner through such potential pain without their consent or awareness. That's how I feel about cheating, and having a sexual job like this while your partner is in the dark... That's really not fair.
If you want to cam and they don't want you to, then tell them you're going to do it anyways. As it is, they'll find out regardless. This way, they'll at least be aware of the situation and can make their own decisions on how to approach. Everyone's honest and you can jump into your new career without the stress of juggling a double life!
If your husband is a jerkyjerk face whom you plan on leaving, then none of this applies and you should dive in to make as much money as possible in as short of a time as possible. Which means I'd nix the masks. Wearing a mask typically will have a pretty severe impact on your income - and many sites don't allow it at all. But showing your face and losing the anonymity will earn you more money! But very, very few models are able to make a significant amount while wearing a mask. Not saying that there aren't exceptions to that rule, of course. But it's definitely not the norm.