Watercolour can be difficult but practice helps a lot as well as understanding the various techniques of applying the pigment to the paper, transparent and non-transparent colours, layering, knowing your colour wheel and being patience.

What type of paper and paints are you using?
Your flamingo has a poster-like appeal with the strong colours and that may be what you're trying to achieve. Your watercolours are laid on the paper in a rather haphazard way. Again, if that is your intent, that's fine. Most watercolour is put down in washes that aren't streaky, such as the sky. Now you can achieve clouds by removing some pigment from the wet paper, but that's another technique...

What I do notice is that you are increasing the depth of your shadows by using the same colour with more pigment. That can work to a degree, but introducing more complementary colours into your piece to make up the shadow sections works much better and gives depth and interest to the shadows. I'm not seeing a strong sense of light source in your piece. There are parts that are lighter, but it isn't consistent.
Its worth playing around with the palette of colours on a scrap of paper to see how they look and perform before you put them on your actually painting.
Also watercolour works very differently depending on how wet or dry the paper is. You can get wonderful effects with lost edges or crisp sharp edges that work well too.
My suggestion would be to practice as much as you can and to observe very carefully both your subject and the light source. Drawing and knowledge of where your lightest areas will be are crucial in watercolour. I always say that for every brush stroke you put down, you should look several times before you do so. Its easier to add than take away with watercolour.