The first thing most beginners are not aware of is the importance of a good colour consistency in order to achieve a satisfying result. I painted with barely dilluted paint for many years because nobody taught me better. The result was very bad, blendings didn't work at all. Furthermore I emptied my GW pots very quickly because I used tons of paint.Go here to learn how thinned paint should look. Via.
*Buy acrylic paint sets at eBay.