Art buyers are nothing if not emotionally driven. They look at snow and ice in a painting and will often visibly shiver right in your steaming tent. This is never the response you want, is it?
Save the chilly pieces till fall when they might have a prayer of selling.
A painting like the one opposite evokes responses like, "Wow...that is so relaxing. I feel like I could lay down under that tree and sleep for a week." It might do very well in a show you expect to be hectic and harried.
The bottom line is this: Keep your market in mind when you decide what your next painting will be. Also, remember to size it appropriately, as well as plan the framing ahead of time. You should be able to visualize the finished product before you even lift a brush.
Keep your frames generally similar; a hodgepodge of sizes, finishes, and shapes will not display your work in a professional light. I go so far as to diagram my hanging plan so that it ends up looking like a well planned wall hanging you might put in your home.