My advice to new models.
Be absolutely BRUTAL in selecting images for your portfolio. Just because you 'like' an image is no reason to post it. Look at an image from all aspects, and if it falls short... don't post it. Your portfolio should show you at your best, not the photographer's persuasiveness, ingenuity, or technical skills. Photographers have their own portfolios, why waste your image slots promoting them.
Questions to ask yourself... Is the image about me or something else? I see a lot of images where models are posing in front of graffiti filled walls or fancy cars. Do you really want to compete for attention with a wall full of graffiti or a fancy car? If YOU are not the main thing in the image, pass on it.
Does the image show me at my best? Is your makeup sloppy or your hair messy? Pass on it.
Is it an image that shows what I want to do as a model? Photographers will try to talk you into posing for images they think will get their portfolios views. That frequently means nudity, fetish, bondage, etc. If you aren't happy doing that sort of work... don't post it in your portfolio. Once an image is on the internet, it's likely to be there a looong time, even if you delete it from your portfolio. It'll hang around in lists, etc.
Your portfolio is your 'advertisement' for your services. Keep it professional and high quality, and you'll get work with folks who do quality work.