There is an art to making your images look and feel consistent - and I'm about to dish out all of my knowledge on how to get your images looking cohesive and consistent in just a few steps. There isn't really a set number of steps to follow, so if you can't do one of the suggestions, perhaps try another - we've all got different budgets and lifestyles, so try a few that suit you best.
Invest In A Photographer
One of the ways you KNOW you're going to get good, quality, and consistent images is if you work with a photographer. They'll use the same camera body, the same style of editing and will shoot you in a way that is familiar. Make sure you pick a photographer that you connect with - there's no worse feeling than appearing for a shoot and the both of you not vibing together and it feeling awkward because it will show in your images too. For all of my new website and social media imagery, I worked with the amazing Rebecca Douglas Photography. We had a two-hour shoot and I'm always blown away at the number of images that she captures, and the variety of them. I know not everyone has the funds to invest in a photographer - so moving on to the next suggestion.
Use The Same Camera
If a photographer is out of your budget, then try to use the same camera or phone to take your images. If you switch between your camera and your phone, then chances are they will look very different. A good professional camera will have more capabilities than a modern phone (although not much) and a very different kind of quality and overall look. So, commit to one - either your phone or a camera. This will help keep a consistent look for your images.
Think About The Aesthetic
Have you thought about what colours will be in your images? The colours of your clothes, the colours in your environment - all of these things come into play when creating a consistent set of images. If you like bold colours, then wear bold colours, stand behind a colourful mural. If you want a range of colours and/or styles, then make sure that this mix is apparent throughout your imagery - whether this is on your website or social media.
Use The Same Image Editing Style
Your editing style also comes into play here too. Now you've chosen what your 'look' will be, the style of editing will make your images feel like your own. Perhaps you've gone for something dark and soulful, or light and bright, or perhaps even a more natural look that's clear and sharp. Whatever your image editing style, stick to it, and only make small adjustments. Your editing style will change as time goes on, so making small adjustments here and there over a period of time allows your editing to style to change slightly without a stark difference. I like to edit my images in Adobe Lightroom Classic, which is a desktop subscription-based piece of software. But if you don't have a budget for image editing software, VSCO and Adobe Lightroom Mobile are fantastic mobile-based image editing apps that you can use, and I would definitely recommend them. VSCO has both a premium and a free version - I've written a blog post all about editing in VSCO which you can read here.
Have Some Fun!
Photography and images editing is a journey, and a journey in which you can learn many things - so make sure to have some fun! Experiment with your photography and images editing style; find something that works best for you! I have so much fun editing my images and am always playing around with the style and look of my images, and I want you to have all of that fun and wonder too. Don't put any pressure on yourself for your images to look a certain way - photography is a beautiful medium for expression and is incredibly subjective, so experiment, learn, and have fun!