sweet imagination and concepts! overall this SB is diverse and beautiful.
When you finish a piece balance out the soft brush strokes with hard brush strokes. just balance it. Soft brushes may be your style but i think adding hard edges and refining your edges would make your work more depthy and nice.
Google some new brush sets
This guy's brush set is amazing.
Also try Daarken's he has more numerous brushes.
Would love to see more. Keep at it!