I would agree with most of what Steve has said about the images. Also he hinted at something that is very important in photography, everything thing about it is personal choice, what one person likes is not neccessarily another persons cup of tea. You will find this in all aspects of photography even if the photographer is considered the best in the world there will be people who do not like their work. This is one of things that makes photography interesting, sometimes controversial and the reason why people look for critiques.
If you are shooting images for no other reason than just for self pleasure then what i would say is that so long as you are happy with your images then the job has been done well.
Here are my personal opinions (this is what i feel, these may or may not be shared by other people but that is the way these things work).
Image 1- I think is a job done well, insects are not the easiest things to photograph ,but you seem to have captured this one well. The one thing i would say and i doubt you could have done much about it is that the orange line running through the background is a little off-putting.
Image 2- Sometimes wonkey horizons can work well, and i agree with steve in thinking that this one was probably like that because the road appears correct, however i would probably have straightend this one up a little so long as the road didn't look too silly afterwards.
Image 3- Great, really liked this one, the contrast between the trees and the snow worked really well. Also the way the tree line drew the eye into the picture from the left up to the detail in the cloud works well. The small patch of trees on the right of the frame are well placed too, without them the eye may escape from the frame. The one thing i cannot decide on is the small tree in the middle, my first thouht is that it needed to be there, but after looking i'm unsure. As a taken picture from the landscape it is brilliant, but if you do play around with image software such as photoshop then it may be worth looking at the image with the tree removed, but if not then you can be happy with result you got on this one.
Image 4- Simplicity works well in images, and this is a simple image that has worked well. Lots of people work with the rule of thirds as i do going across the frame from left to right, however i like the sky (i think being from Lincolnshire i am used to flat land and lots of sky), i often work with fifths for the top to bottom view. My personal preference on this image would be to keep the hut where it is but just lower it a little in the frame, also i would have liked it a little simpler still and tried to keep the sheep out of shot. Like i said personal preference and thats not to say i do not like this image cos i do.
Image 5- Out of all of them this is my least favourite image. before i spoke of simplicity, and in this one there is too much going on for my likeing, it requires he brain to fill in too much detail as a lot of parts have been chopped off which means also a lot of lines are leading out of the frame. My eye struggled to find the point of interest. The subject matter is good, and for me it is close to being an image i would like, maybe from a different angle or even slightly closer/further away it would work.
All in all though a good effort, one you should be proud of. Practice makes perfect (though in photography it should be practice makes better if you are lucky). Like Steve said the eye is definately there!