What program are you using?
If your designs have smooth shading, you may have to sacrifice a little of that detail to halftones if you want it screen printed. If you don't want to do that, you might look into sublimation or heat transfers.
If your designs have smooth shading, you may have to sacrifice a little of that detail to halftones if you want it screen printed. If you don't want to do that, you might look into sublimation or heat transfers.