Exposure is not your problem
Sharpness is.
There are always five factors to sharpness factors to sharpness. and a few technical ones that we will not discuss here.
namely,,
1)Camera shake,
2) subject movement
3) focussing
4)Quality of lens
5) ability of your DSLR to focus correctly on the sensor with a particular lens.
It is evident that the images that you are making are nowhere near critically sharp.
it would be easy to check which of these or a combination of them is contributing most to your problem.
The first can be eliminated by the use of a tripod and remote release.
If that does not solve the problem then it must be one of the other four.
was the subject moving, if not it must be with the remaining three..
Try manual focus., if that does not solve the problem. it must be one of the other two
do you have the same problem when focussing with live view as with auto focus or is it only with auto focus,
if so your lens needs calibrating with the body,
If you do not achieve critical focus under any of these circumstances Try another lens.
Attached is a shot of a pigeon on the roof of my garage taken at the long end of my Fuji (budget) XC 50-230, hand held leaning against a door post.
I would expect any reasonable quality lens to be able to do the same. (100% enlargement)
