Since yesterday, I have switched to acrylic in terms of the medium I used. I felt kind of like readapting to it. However, shortly after, I began to like it again. It is known to many artists that the problem with acrylic is the fact that it dries too fast to have a smooth color transition. I have never used any commercial tarders, but I learned from other artists online that the glycerine which you may get from the pharmacy works just the same.