It will take more than three days to heal. You won't know until then what the problem is. And please, don't ever do that to yourself again. Sorry, but that's just awful.
What day did you have the tattoo done? Kind or hard to give advice without knowing how long you've had it.
In general though, the inner bicep is thin, delicate skin. I don't see anything in your pic that would cause me to worry.
As opposed to what?
Nobody knows.
You are a week in. If you read your own post, you'll see you're getting better. We all heal at different rates and different body parts heal at different rates. It's unlikely that anything you do at this point will affect it one way or the other.
I'd quit screwing with it at this point and just put a little cocoa butter on it twice a day and let it heal. You've been to a doctor, so it's unlikely you'll get better medical advice on an internet forum.
Step one - narrow down the style. Do you want Japanese, Traditional American, Realism, New School?
Step two - find an artist that specializes in that style.
Step three - ask for a consultation. Be open minded. I went in for a Kokopelli and wound up with a Japanese sleeve. Now I'm 3/4 of the way through a Japanese body suit.
1) I don't think so.
2) If you don't know what you want then you don't know if you have a good artist. I've seen people that are fantastic with Japanese style that are not so good at other things. If you don't know what you want, you don't know if the artist is any good at it and so you don't know if you have a good artist.
3) Yes.
You seem fixated on this artist. That's a recipe for disaster.
That's what a good tattoo artist does. 😉
Find someone that is good in the style you are looking for. Why on earth do you want to go to someone for something outside their "normal stuff?" The whole point of choosing an artist is to pick someone that is good at what you want.
If you want to pull that many ideas in a piece you'll need some major real estate, probably your back would be best. I'd suggest finding a really, really good tattoo artist and work with them. That's not going to be quick, easy or cheap.
Excessive is not a single exposure, but prolonged exposure over time. Below is a pic of my motorcycle gloves. This is what the sun does to your skin and your tattoo. Top is part of glove that faces the sun; bottom is the part that doesn't.
Rather than deciding on a STYLE based on longevity, get the style you want and then a DESIGN that will last. I've seen some American traditional pieces that look like a hot mess.
It's very unlikely that you will develop enough muscle in your forearm to affect the tattoo. Maybe if you get as big as Arnold, but not many people have the discipline, or more importantly, the genetics, to get that big.
That's a lot of scabbing, but try not too worry too much because you really can't do anything about it at this point.
I'd recommend reading this:
https://www.healthline.com/health/how-to-get-rid-of-scabs#treatment
Good luck
Looks more like bruising that blowout, but it takes at least 4 weeks to heal, so you won't know anything until then. You should know that thin lines on delicate skin, like that near the ditch, are more prone to blow outs.