Becoming a serious, respected artist involves a lot more, I'm discovering, than practice, practice, practice.
As The Thinker suggests, one has to do some serious consideration on the following subjects:
2. Color Palette
5. And most important of all, subject matter.
Being a beginner was awesome--just get an idea an go with it. Sometimes it would even come out passably good. The trouble is, the more you paint, the more you realize how much you need to learn. (As in, the more you know, the more you know how much you don't know.)
So, coming to the point in your career when you feel it is time to do a cohesive body of work to present to galleries, you are faced with the above list of criteria and you may think: "This is too much work. Why can't I just do it the way I always have?"
This is why: To be taken seriously, you must be serious in your planning, execution, and presentation. If it all comes together, you will not only have a body of work that speaks of who you are as an artist, it will no doubt be considered your best work to date. Up the ante. Be brave. Just do it.