I'm not sure how to best critique this so I'll just do this:
The paint lies on the wall: a picture of pain, a poitrait of a sunset drowned out by rain. Similarities remain through ever-changing images; all with the same palet but different shades of grey. Last night I started to cry; my brush my only cure. A reflection of a child stared out of my mirror. Stroke by stroke I painted over the face that was washed out by tears and so different from yesterday; for yesterday was full of joy and poitraits of flowers. Now the rain has come again; and I; a coward return to my paintbrush; my only true power.
Capitalization and punctuation are very important for defining your lines and ensuring you convey your true thoughts accurately.Gramar is also important if you want to be taken seriously.You may also note a few other changes.