Hey! I always listen to Low-Fi or these Café music streams while working. Just very relaxing :)
I made the graphics in photoshop using isometric perspective and a lot of patience. I'll uploade a video-devlog soon where you can see the process.
For Voxel art I would recommend looking at some basic pixel art tutorials first. They teach you a lot about shapes and color. Adapting that knowledge into 3D Voxels should be easier after learning the basics in 2D.
Cheers
Simone