Mask

[Marina_m27]

Hello, so when im trying to color places in layer that i masked, only grey and black color are filling, i have no selection of greyscale mode anywhere. What to do?

[davescm]

Can you show a screenshot of your entire workspace including the options bar and the layers panel.

Dave

[Marina_m27]

[c.pfaffenbichler]

The active Layer appears to be a Shape Layer. 

Either add a new Layer or rasterize the existing one. 

[Chuck Uebele]

Is your image in grayscale mode? Change it to RGB.

[c.pfaffenbichler]

You appear to be painting on the Layer Mask, not the Composite. 

Edited