10 Aug 2016, 13:53

Normally paintings look chalky because of insufficient contrast. The difference between your lightest light and your darkest dark is not strong enough. I have run a level adjustment on your paintings, and I think it already takes some of the chalkyness away:
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A good way to approach painting at the beginning is to work with black and white first (as it used to be done with oil and pastel painting - that is how I learnt it at least!) and then add color in a second phase. There are several ways to approach this process, and many tutorials online (I even have a YouTube video that shows that!
Another factor you may want to consider is your brushes - if you like the rough look that you have here, maybe you should try to work with textured brushes, so that the strokes look less "digital" and you get a more organic feel in your textures.