For a beginner I applaud you
It seems you can paint anything you want.
You are not limited to any one style.
The hurdle with that is ... finding out which style pulls the most audience. So use all the styles you can.
Your market will tell you ... which style prevails.
Rockwell could paint wonderful abstracts - but his market wanted his figurative paintings.
DeGrazia could paint realistic murals - but his market wanted his faceless children on note cards.
can paint anything - but her market wants her tertiary colored still life paintings.
Kinkaid could paint lovely cityscapes - but his market wanted old world country cottages.
So - you are in good company.
Here's my feedback:
Your red umbrella image works ... because it is a bolt of color on an otherwise monochrome background.
It is a style many artists use for solo shows. I know an artist
who left hair dressing and today she uses the same technique with seascapes. And her paintings just fly out the door.
For me the seascape works ... as crashing surf is a hot theme in seascapes.
You seem skilled with the camera and I would hope - the computer. I would run this image through something like Photoshop or some other photo editor to ramp up the color contrast. This technique will save you a lot of trial and error.
The third image ... a blue mood piece - is also pretty good. I would play with the high-light of the eye.
It is possible to high-light the eye in such a way ... that no matter where the viewer stands ...
it appears the eye is looking right at them. That is a riveting technique that some portrait painters use.
Wishing you well -