I am in favor of letting the tree kind of grow wild for a while until you have it set in your mind what a Shimpaku Juniper bonsai looks like. You need to look at some videos by Bjorn Bjornholm and Ryan Neil working on some big Junipers. You need to recognize that there are certain characteristics that are present in all first rate Juniper bonsai. Once you start seeing these kind of things you can start recognizing directions in your tree. The first and main thing at this point to consider is that all first rate Juniper bonsai have a good deal of dead wood demonstrating the struggle with nature. Look in all the bonsai books, magazines, publications and web sites; try to find a Juniper that does not have this feature. That means that you do not cut off unwanted branches, you just disable them in some way so that the bones remain.
I know you have said that you lack the ability to recognize style possibilities so, you are looking for advise from the rest of us horticultural perverts. The best and most pleasing results are obtained from within yourself. I am hoping to help you develop an eye for this stuff.
It really is dumb sounding at this point, but many beginners look at the tree styles defined in the books and then look at their tree and then try to chose some style that they like and then think that maybe they can make there tree look like this tree here on page 129. We have all been there. Or worse; they have a tree like the one you have and think well; I bet I can make it into a cascade, beginners love cascades and wind swept trees, two of the most difficult styles to pull off successfully by experienced artists and growers but the most often chosen by the newbie. Here is the problem; the style is chosen and imposed not negotiated. The good bonsai are the product of a relationship between the tree and the artist. This is what you need to recognize and develop. It takes time but you need to start with the artistic research first.
