can anyone do a photoshoot with me for free?

Wow, I think you should be careful asking for this sort of thing. There are many strange people out there on the internet who would be more than happy to take advantage of such an offer. You should know that the reputable photographers will do a portfolio without charging for their services and will put you out into the world of fashion for a commision or royalty once you find work. Please do not pay any money or get involved in any dealings with people over the internet without a full understanding of what may be involved. Also, by the photos you have submitted you will have no trouble finding a professional photographer to do a portfolio for you. All the best, good luck and stay safe. J.