I recently finished this painting of an owl using acrylics. I'm happy with the look of the owl in terms of proportions. Not so happy with the exaggerated outline, and the background. Using acrylics is a bit of a pain in terms of drying out and work-ability. I have a hard time creating smooth transitions, and use acrylics a lot as a wash (which I'm not sure is a good idea). Feel free to critique, and to share any tips regarding painting in acrylics.
One thing I struggle with and would like help with to improve is my line weight and variation. I've heard various artist's mention the importance of varying line width in drawings, and I love seeing it in drawings of others. However I don't know the "rules" of when to vary my line thickness especially in the outline. In a lot of my drawings I tend to outline too much (see the attached portrait of a guy for example) which tends to give it a stylized look. The other drawing of a horse is from today where I try to vary the line thickness of the outline, but I'm mostly randomly varying the line thickness. For the core-shadows I think I know how it works (sharp plain change= thinner core shadow, gradual plain change=thicker/softer core shadow). Does anybody want to share their tips, or point me to a good resource on this? Thanks