OK (deep breath).....
[all spoken with no insight into how much you need to live on, other family income sources etc, and my previous comments on redundancy terms - you might need to earn £5k, £50k or nothing for the next 5 years - per annum... and with the best intentions]
- Landscapes. Very very very few people can exist as a FT landscape photographers - most of the exceptional ones - Joe Cornish, Charlie Waite, David Noton etc also run tours, sell books and give talks and obviously you need some reputation to be able to do all of those additional things. Your views are nice but compared to what pros and talented enthusiasts produce you have some way to go, critically you are missing exceptional light in them.
- The rest of your Flikr stream in my honest, but I'm afraid relatively blunt, opinion is that there is very little in there that is saleable even as secondary editorial stock. Sorry but as you have noted in your initial post you need to improve to be able to sell.
- Models. Right. With no experience, and having never photographed people before you are going to struggle again in the short term. There is a long queue of talented, experienced photographers, shooting fashion, beauty and glamour. There is an even longer queue of "male enthusiasts" willing to pay models for the privilege of shooting them or supplying work on a TFCD basis. I couldn't quantify the size of the market, but I suspect it is hard to make any kind of living from it unless you are established - very few models are going to pay *you* to photograph them when they will get higher quality images for free.
- Coasters. Part of me thinks that you have lucked out not selling them. £3.60 for 3, including 1st class postage. I'm not sure you are making any profit on that let alone proving a decent hourly rate of income. That has to be a limited market - and I suspect you might only sell them in gift shops at or nearby fly fishing areas it is a hobby income at best.
This industry is really tough, saturated in many/most areas, and fees and rates are dropping not increasing. It takes a while to get established if you already have the technical, artistic and business skills to succeed and with every year the competition gets harder. I'm by no means saying you couldn't ever become a professional photographer in time but I have to point you back to my original post and say that my recommendation is that you find yourself some paid employment - and then spend some of your non-working time to learn, improve, understand where your strengths are, build a portfolio and a professional looking website/marketing material and start to win some clients, sell some images and gradually increase the revenue you make as a photographer - with the safety net of a job to fall back on. If it all goes well you can quit and go full-time. Where you start on that I'm afraid is very hard to recommend without some focus of what you expect to earn you 60%+ of your income. So many courses teach very little or prepare you for the real aspects of running a photography business that you could spend a great deal and progress very little.
Right now you have limited skills, no clients, and no idea of where to focus. IMHO if you tried to earn a living solely as a photographer now, in any genre, you'll fail. Sorry but I'd rather tell you the truth than try and sugar coat it.