Artists sometimes ask us if they should specialize, such as sticking to all seascapes or just figure work. The consensus seems to be: It's more important to have a consistent style than the same subject matter.
From this blog:
Artists: Are you Consistent? A Gallery Owner’s Perspective
You can paint landscapes and still-lifes as long as the style or presentation ties the work together.
Here are more articles to give you some perspective:
Another good resource is Alyson Stanfield:
Our world-class customer care team is here for youContact Support