UV Map Not Appearing on Top of Assigned Colors

I am trying to add a transparent .png file over paint brush to which I have assigned colors to but I cannot see the .png on top of the colors. I am not sure why it is not working? I have added the UV map (transparent .png) to the textures but it is not showing up on top of the colors. Any idea why?

Top Image - Model with colors assigned to selected polys
Bottom Image - UV map only