Juniper Chinensis first pruning, cutting back too much? Styling advices needed

Hello! I'm pretty new to bonsai and after my JBP died, I did more research on proper care, and went grabbed some more, including this chinese juniper, along with chinese elm and larch.

Today I decided to give it a good clean up as it's pretty overgrown (first image), it's my first time to actually practice big pruning like this, other than a bit of a clip on the elm.

Here are my questions:
1. Am I cutting off too much foliage? I know many people say do not cut off more than 50% of the overall mass, so I'm a bit concerned.
2. Is it the right move to leave the remaining foliages long like this? I'm a bit scared to cut it back further, and maybe leave it that way will thicken the branches a bit overtime?
3. How to move forward in terms of styling, initially I was thinking going towards cascade or semi cascade, but after pruning, I'm not really sure anymore. I do have aluminum wires in different thicknesses, but I'm trying to get an idea first before wiring it up.

Please share your thoughts, thanks for reading.

Hard pruning of junipers is done in late winter to early spring. Tip pruning for compact growth is done in late summer in my conditions. Very hard to say how much abuse it takes out of season in an unknown climate. But I would definetely stop now.

Why did you buy an informal upright prebonsai if you wanted a cascade or semicascade?

There is still a lot of learning you need to do. If you stay in the hobby, 5-10 years from now, if the tree still lives, you will laught at the tree and spend considerable lot of time waiting for unpredictable backbudding and trying to figure out how to fix your misstakes.

Why this hurry? We are working on living materials. Next time, plan your work better. Spend time looking at the tree trying to figure out what is the best approach before perform the work. And once raking action, do so at the right time of the year.

Hi thanks for replying!
I live in the UK zone 8B, based on my research in different communities and forums people seem to prune or refine mostly in summer and wire in colder months, and only prune/shortening roots, never both, so I gave it a go.
However I do think I pruned too much foliage at once, I admit it's my newbie mistake, it's the urge of doing something about it and I went too far, not just this, but also removed many back buds on the branches...
it was purchased online and based on the picture I couldn't see how the branches look inside the foliage, that's why I was thinking doing a cascade of semi cascade, but during the pruning, I definetly don't think that's a good idea at all.
My current plan is to just let it regain the vigor back without doing any work on it, might take years, and I think at least for this year I shouldn't wire? 
 

You have a nice tree, I don't think you have done too much, and if you know how to wire properly then you can do it now. I think you need to find a local club, as you will get much more from others than with videos. You can ask questions and get hands on help. You don't say where you are in UK, but there are clubs in most areas. Have a look on the UKBA web site for a list of clubs. If you are looking for another tree get to a show or nursery and choose the tree you want, 

Hi thanks for your reply.
That ease me off a bit haha, I really don't want it to die.
I'm fron Nottingham, and Greenwood nursery is local to me so I can always pop in to them (when my hay fever isn't as bad), in fact, this juniper is from their online store too.
I think joining a club is really good idea, will definitely looking into it and find a local one if possible.

You can't go wrong with Corin, and there is a club close by. You will not regret it, great fun. Corin's club come to the Swindon show each year.

Agreed, his vids are really useful, I'm planning to join an introductory course soon, that way I can learn the basics and wiring techniques, also taking 2 trees home.