Answer:
Intransitive - The sentence needs and object.
Transitive - The sentence does not need an object.
1. Cindy paints portrait. --> Transitive
2. Cindy paints beautifully. --> Transitive
3. Cindy sells to collectors. --> Transitive
4. Cindy exhibits in local galleries. --> Transitive
5. Cindy sketches people before she paints them. --> Transitive
6. She first outlines their features. --> Transitive
7. She enjoys painting. --> Transitive
8. She paints on vacation. --> Transitive
9. She paints in the hospital. --> Transitive
10. She paints everything! --> Transitive
I am not sure if all them are right, but hope it helps and tell me which ones where wrong since I am not that good in English. Thank you :) !!