i have a blaze orange sweatshirt that i drew my own camo on. my question is wwould the camo work better if i made it all 3d instead of just lines.

lines should help to break up an outline

Just check your state laws before using a broken up blaze orange as your required orange. I know in Alabama even those orange camo coveralls you can see for 3 miles will not make you legal because it isn't a solid 144 sq. inches of orange.