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Yes.
If your art is good/excellent, professional in quality, and there are detailed city portions as well as detailed add-ons that price will be several hundred dollars, don't even balk at it, you're going to spend like 40 hours on a map you deserve a week's worth of pay at least.
If your art is good/okay and in detail, it'll probably be around $300-$400. I've done city maps in this range, simpler ones without add-ons, or that are just streets and labels without custom houses woven in.
If your art is evidently that of a beginner, but still highly detailed, no less than $150-$250.
If your art is that of a beginner, obviously so, rough and sketchlike in form, and you are simplifying the needs of the city in every single way, you should still charge no less than $75-$100 for an ENTIRE. CITY. Feel free to take it in this range if you want to practice but you will see after that commission why we're saying multiple hundreds are the right way to go.
Yes, they may have been one of the people who came here who we told it's not possible to get a cheap city map trying to exploit you. Given you've had to come here with questions, please consider dropping us a link to the Discord because obviously they need pro-commissioners to help around there getting you newer artists up to speed on industry pricing and why we do price that way. Your time as a beginner is valuable, being in a video game does not trump the value of your time unless you choose it to. There is ONE human on the face of this planet who I would gift free map art to on demand. One. And she would never exploit that, and similarly she gifts me the value of her skills which I would not exploit. You don't know this human or their integrity, so, negotiate payment NOW, before you start work, or they'll go "haha I thought freelance meant no payment required". Some beginners will scoff and try to fiercely undercut to acquire all of the business. This is a foolish mistake. I did it when I started. It resulted in me being overloaded with work I could not complete well because there was too much for too little money. It wastes these people's time and ultimately money as they'll have to commission a professional anyway, at a high end turnaround fee.
You did not post your map so I cannot really suss out its value. There are definitely cities that are cheaper than other cities to produce. You know how long it takes you and the value of your time (which SHOULD NOT BE LESS THAN MINIMUM WAGE EVER). If it took you 20 hours, then at a mimimum wage of $10, you charge $200 and don't feel bad. I would myself consider charging $600 for that same time since I am an experienced map commissioner.
It's only worrying if you have not talked payment at all and you've started work. If so, that's your bed to lie in, because that was a mistake with anyone but an established client. I have one person who I will start work for, maybe two or three, without payment being negotiated, because they've hired me on several occasions and paid so I know all they need is an invoice.