Version 2.0 update:
after I connected the grid pattern sometimes visible in bright or dark parts of the images with the fp4 training with OneTrainer, I switched to fp8 training, which got rid of the pattern. But I have to redo all my LoRAs to fix them all. For the dataset I used only the images with real small glasses, but they come still out a bit on the bigger side. I decided to publish both versions - the 40 epoch version is the normal one. If you really like the John Lennon glasses try 100 epochs. The images are a bit more like plastic and the colors a bit bled out, but the glasses are smaller. Nothing changed in usage, except the tag is now <lora:WireframeGlasses-SmallRound-step0720:1> - or step01800 respectively.

Flux seems pretty limited if you want glasses - mostly the more round sort with a thicker frame. I intended to make a all-in-one LoRA first, but that didn't work - if you want to specify between normal and small glasses, round, rectangular and oval shapes you had to train each one separately. This creates small round wire-frame glasses - hard to find today but in use for a long time. If the result is not as round or small, a <lora:WireframeGlasses-roundSmall-60:1> tag increases the influence. It has also the potential of creating several colors, in the examples is a gold one.