The lighthouse is great, Daemoria. The colors are very appealing, and it works compositionally. I would either shorten or lengthen the tower itself; atm it's touching the frame of the picture and creating a tangent (when two objects in a picture meet in such a way that you can't tell which is behind the other); this flattens out the image and gives it a more graphic sort of fee. If that's what you want, great, but it looks like you were aiming to create a sense of distance, and tangencies hinder that. The end of the promontory on which the lighthouse stands and the rise of the distant mountains is another near tangency, as is that stalagmite (menhir?) rising up right below it, and the stalagmite rising up in the foreground creates one at its tip with the hill. I catch myself doing this too; it's almost like the brain is wired to do it subconsciously. Gotta watch out.
Also, those deep, black shadows on the lighthouse are working against you. In atmospheric perspective, the colors of shadows lighten in value and shift toward the sky color as they recede into the distance. Everything also loses contrast and shifts towards the blue end of the spectrum as it gets further away from the camera (because the air filters out the longer, weaker wavelengths (the red-yellow end of the spectrum) and only allows the shorter, bluer wavelengths to pass (this is called Rayleigh scattering if you care).
You can see this in just about any photograph with a distant background and a near foreground.
http://www.everestuncensored.org/Hiking/05032009/36%20A%20distant%20hill%20is%20Fulchowki.jpgNotice how in the background, everything takes on a blue-ish cast. If you open up such photos in Photoshop and run the color-picker over them (an excellent learning experience imo), you'll notice that even what look like browns in the distance are usually actually warm, desaturated blues. Everything moves towards blue, and all the highlights and deep darks wash out. In the foreground, the lights are lighter, darks are darker (and probably warmer), and things retain their true colors.
tl;dr: atmospheric perspective = things lose contrast and shift to blue as the distance between you and them increases.