Enable Printing Method effect
It would be great that when making a mock-up, you can select a printing method effect, so the design would change its color intensity or texture.
For example, right now when you upload a design you have like a transparent mask that create an effect of screen printing water based ink. The image lose color intensity. This way we can't offer the real finishing in the product.
There is a lot of printing types for clothing so it is impossible to make a mock-up with Transfer Printing effect (full intensity of colors), or heat transfer vinyl, or metallic effect, flock, glitter, or at least embroidery effect.
If this is not possible, at least put an option where we can choose if we want to see the image with original colors or with your mask because we lose a lot of color intensity in your mock-ups.
Hope you can make this changes and features.