Easy way to do 3d artwork

I'd recommend blender because it's free and so are a lot of the resources available for it. A scene like this would be pretty easy to build with some free models off of sketchfab once you get the basics of the software down. If you're interested in learning blender, check out Ducky3D on YouTube. His tutorials will show you how to use it while you make some cool projects which have elements that can be recycled into things like that flamingo image.