hi 
well - i think your work has certainly been getting better over the months. i don’t know whether cypherx is acutally giving you exercises…however, improvement…apologies if you’ve heard any of this before…
I know it’s easy to become overwhelmed by the need to draw things you see in your head, images and ideas. All I can offer is that the accurate and satisfying depiction of these things comes in time, but not before wading through the nitty-gritty of studying real life.
I think you should begin seriously to study anatomy first; figure drawing is very valuable (as for myself I’m only now realising its fundamental importance) - it teaches proportion, gesture, line, contour, form, value, and eventually colour and all that that entails. This stuff doesn’t necessarily have to take a long time to learn, just lots of effort.
Plus, there’s the anatomy forum here - an amazing resource…
Regarding landscapes and such, it’s really helpful to study good references closely, or better yet to become observant of enviroments in everyday life. I have read a good few books on landscape painting…pretty glossy books, mind, but they help a lot in explaining the principles of perspective, palette and mood, the appearance of objects in different lights, and specifics on textural/material and weather effects etc.
basically there’s only one thing, whatever you’re doing, which is practice. I have to stress that you should just go into art-sponge mode whenever you have time set aside for it: it’s all mentality (not sheer technique) - if you are highly observant and questioning why things look as they do, draw and paint constructively, critique yourself constantly, and always seek out new points to learn, you will improve. And there’s so much depth, it’s a case of learning to realise how little you really know - at ANY stage of proficiency.
As for technique itself, well, that will grow mainly out of practice and picking things up through reading and looking at others’ work. Over time you can evolve techniques and styles unique to you, but i wouldn’t advise it before laying down the groundwork. All drawing is self-expression, so your personality will inevitably come out in everything you make with your own hands, no matter how generic it may seem.
For guidance check out the lovely art techniques and theories forum and the anatomy forum. There are others who can help you better than I can.
good luck!