>>280271798
>>280271640
I'll share a trick I've learned for better transparencies: cut one pixel into the lineart with your cutout, then do a 1 pixel outer glow (photoshop/photopea)/drop shadow (gimp) filter on the layer, set to the same color as the lineart.
Then check your work by paint bucketing white and black behind it. You can get them fairly flawless/seamless this way. Pic related.