None of these modelling services are legitimate, they will promise you the world in a misleading, but not overt way, make you sign away your rights in person (preventing you most legal recourse), and then charge you around £500-£1000 for a professional shoot.
From there, you will never get given any kind of modelling contract and the contract you sign with the 'agency' specifically states all of this but they pressure you to sign and in many cases make horrific threats and inducements.
This is a surefire way to not only lose a lot of money, but possibly find yourself in a compromised position as personal photos can be used against you as a form of threat to hand over more money or sign up to greater packages.
No legitimate modelling agency would charge you for a photo shoot, this is because legitimate agencies would expect you to already have your own portfolio and CV and possibly even your own agent.
I was a senior consumer law expert at Citizens Advice and the amount of cases concerning these agencies was unreal and some of the stories were shocking , and because of how they practice very carefully in a bit of a gray area, there is almost no way to get your money back once you realise what has happened and the single legal argument I used to be able to advise on always came down to "he said she said".