With a deep understanding of JavaScript and its integrations with React, I am confident in my ability to build the FormKit Vue.js 3 Image input that you need. In addition to having a solid grasp on the technical aspects, I understand the importance of adhering to precise specifications. This means I can ensure full compatibility within the FormKitSchema rendering while implementing the imageSelected and imageDiscarded functions exactly as required.
Moreover, I've become adept at display management and event handling so incorporating the thumbnail display for selected images and corresponding discard button will be relatively straightforward. My experience using Responsive design principles will come into play here to guarantee an optimal user experience regardless of device or screen size.
Lastly, I have a proven track record of delivering exceptional projects on time. My focus on effective communication and understanding client needs ensures that your project will be completed to your satisfaction, and within deadline. So, let's work together to make your vision come to life in FormKit!