Combine Images Into High-Quality PDF

I have a batch of images that I need merged into a single PDF. Please lay them out automatically so each page is filled efficiently—no strict one-image-per-page rule—while keeping every picture in its original resolution and visual quality... (Budget: $15 - $25 USD, Jobs: Adobe Acrobat, Adobe InDesign, Automation, Graphic Design, Image Processing, PDF, Photoshop, Python)