I am using a photoshop t-shirt mock up template. But the layer that is meant for putting the artwork is being "covered" by other layers.
This is the original color of the artwork:
When I mock i up using the template, it become like this:
I've tried a few methods, but the problem persist. Please help. Thank you!
Try an alternative blending mode.
Currently the blending mode of your artwork layer is set to multiply - which means it will darken the underling layer(s). With an already dark T shirt you end up with very dark colours.
See below for an explanation of how different blending modes work:
A quick way to flick through blending modes is to pick one then use the mouse wheel to scroll through them and watch the changes on screen.
Thank you very much for your help!!