Light and 3d models problem

So, i just made few test models in Blender and i find them very dark in the new scene. So i created new project, and put them in “SampleScene” and they were totally fine… I even copied light and postprocesing into other scenes but nothing happend…

Here is test model in SampleScene:
156522-testsmapl.png

And here is the same model in any other scene:
156523-testnotsmapl.png

So, how can fix this, or maybe what settings should i check? Or should i just duplicate SampleScene all the time?))

Thx a lot!

@ SinedGG, So if it is a lighting problem, add more lights from different directions, and/or get into the Window > Rendering > Lighting Settings options menu and adjust the Ambient light and other light settings. Also, adjust the Shadow settings for your lights.