Problems with export to nifskope

i made a mesh of mask in blender, now i need to uvmap, it looks correct in-blender when i uvmap with jpeg, with preview available, but for final mesh when I uvmap with the same image as .dds file than export to nifskope and open it there, texture doen’st show up, and second the mask looks reveresed, the front face of the mask looks like the inside of the mask (almost completely transparent) and vice versa, once i got textures to show up… and they were applied only to inside of the mask, i’ve done lots of tutorials and i can’t find answer