>>4226986He's using Corel Painter I think? But that's irrelevant. You just need to toy with the opacity and flow settings to make it easier to blend with any brush. Try setting opacity at 30% and flow to 20%, and color pick a lot to smooth it out and slowly build up your painting in layers.
Alternatively you can use hard round for hard edges, and switch to the soft round to blend out the edges that don't need to be hard. You can also blend with the smudge and mixer brush but I'm not that experienced using those.
