Hi Suzana [emoji4]
I am not sure if this applies to England as well, but I have a system I always follow when it comes to pricing for freelance work. You might know this or it’s old news for some, but here goes :
First you need to find your hourly rate. You do this by adding together all your expenses in your everyday life - rent, phone, food, bills, social money, product cost etc plus what you would like your salary to be each month. Basically what it cost to be you and run your business every month. You the divide the total down to weeks, then days and eventually the hours you work everyday. This will give you a clue to what your minimum price per hour should be. It’s what salons do to see that the income per hour with a client will help them earn to keep the doors open.
When you have your hourly rate you add in expenses for additional products you would need for the shoot, additional travel expenses and other expenses that you find a job to cost you. So take that number and add it to how many hours you will be working and traveling (if it’s a long travel) usually freelancers don’t charge additional travel if it’s under 30 or an hour depending on country.
This gives you a good overview of how much you should be making at a minimum to be able to live and bring home a pay check as a freelancer.
Sometimes the number may seem low, that’s when you add on a profit to competing prices, and if it’s very high than you might be over spending on living/products or just have your pay check unrealistically high.
It’s a fine balance and some freelancers take astronomical prices for their work and others are way to nice and loose money (because they want the job and don’t consider their livelihood)
Hope this gave you some idea on how to figure it out. There might be someone in here who do session work as a nail tech who might know more about the prices in London. But for your own sake and to learn about your own financial situation you should apply this to all your freelance work. It will give you the power to control your money and really profit from your work.
Good luck [emoji4]