I'm not sure where to check up what's wrong with my brush setting or mask setting. I used a mask and regular brush with 100% opacity, 100% hardness, but when I brush on the mask tried to remove the object, the object just keeps showing a shadow, like a light ghost. I've attached screenshots of my brush and the mask image here, could anyone help me with this photoshop setting? Greatly appreciated! 
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1It would appear that either your brush is not set to 100% opacity, or the mask is set to less than 100% density – Scott Oct 26 at 1:44
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...or you're painting with not 100% black color: make sure you're using an absolute black – Sergey Kritskiy Oct 26 at 7:32
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... or the unwanted pixels are on the layer below? – Wolff Oct 26 at 11:04
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... or you could be applying the mask to the wrong layer. Perhaps instead add the layer mask to the group if you want to mask all the layers contained within it. – Billy Kerr Oct 26 at 11:53
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Also possible that you have a selection active (a channel selection would give you this effect). Try CTRL+H to see if it's hidden, or CTRL+D to just deselect. – Joseph Massaro Oct 26 at 16:57
