Welcome to the forums, Marell. On the average, you are doing very good work. You have a good eye for composition and have good control over the camera. You will attract many more critics to review your work if you post only one or two images to a thread. Let's take a quick run at those photos.
#1. Great composition/Great color/Excellent Depth of field. A pro quality shot, marred only by the funky white stuff on it's (captive) nose.
#2. Again, great color, good composition, framed a bit too tightly. DOF is a bit too shallow IMHO. Eyes in focus - good. Only eyes in focus - not quite as good, perhaps.
#3. Good. Framed a bit tight above lion's head? DOF a bit shallow - would be nice to have detail in eyes and whiskers both (for me).
#4. Superb composition. Could go further with DOF, but having entire front of the face in focus is good. Could crop in slightly on the left. Good color. Some light and shadow challenges. Some elements in lower left could be desaturated a bit to limit pulling attention away from subject (a minor point).
#5. I'm lukewarm on this one and to be honest, I'm not quite sure why... perhaps others can verbalize what I'm thinking???
#6. Color seems off on this one (blue tinge - most evident on white portions of the shot). Lighting was not kind to you on this shot.
#7. Even though it is obvious that you fought to focus on the head (which you achieved). The prime area of the shot being presented (and most noticeable) is the tiger's blurry rear-end. There is not enough visual separation between subject and background, causing subject to get lost in the shot.
#8. Reasonably nice color that may lean toward blue (is the parrots beak blue in real life or should it be blackish - I'm not sure...) Again, I would've gone a bit deeper with the DOF to catch the beak and a bit more of the surrounding feathers. Again - eyes in focus - good. Only eyes in focus... leaves an awful lot of the shot out-of-focus...
It's an artistic choice, but for me, I'd like to see a bit more detail on the bird.
I think you have great potential. It is obvious that you are working hard at it. Keep hitting it hard and I think you will develop abilities that would be conducive to bringing you a photographic income that could steadily increased over time - if you desire to do so.
Regards,
Mark