Thank you very much, I did my best on this design haha ​​so I tried to make it as faithful as possible to my concept

Lovely clouds here. I think you captured the thin, webby nature of clouds that I think is missing in most artists' takes on them

oh now I see.

I guess cumulonimbus clouds are the ones that cross from the horizon to the upper air. Cumulonimbus clouds are thick and compact and do not have broken edges like cirrus clouds.

 ¡Gracias! En realidad, trata de hacerlo con una perspectiva diferente, como si te estuvieras mirando desde lo alto de una colina. Y sí, parece un lago, de hecho, al principio iba a hacer así, pero tuve que reestructurar todo desde 0 nuevamente. Tomaré en cuenta tu comentario, muchas gracias por la verdad.

It's beautiful. I love the reflection and the fact that the colour between sky and water barley differs. I would really say it's a lake - with such calm water. I think that there is one problem with the perspective. The edge of the water goes up to the horizon but the island with the lighthouse is much much closer than that so the tip of it shouldn't lie on the horizon. It creates the illusion that there is an edge of the water just behind that island or a waterfall. We should see something similar to this:

https://www.daysoftheyear.com/wp-content/uploads/lighthouse-day1-scaled.jpg