A little ocean alcove (I think that's what it is) critique, and some other questions

Lewkaz

I tried doing this without "undoing" and with a square brush, I've never really gotten into traditional painting (I prefer sketching), and I've noticed that the mountainous rocks in the background seem unnaturally shaped. Also, a question on the side is how to get a really clean, detailed and metallic/shiny effect like some of the new League of Legends splash-arts such as: http://ddragon.leagueoflegends.com/cdn/img/champion/splash/Gangplank_7.jpg
http://lolskinconcepts.com/wp-content/uploads/2015/04/Ziggs_Splash_5.jpg
http://ddragon.leagueoflegends.com/cdn/img/champion/splash/Orianna_0.jpg

xeoncat

Hello,
I think you should try copying from a photo reference or real life. Do not neglect the power of references. You will have a wealth of shapes to draw and the most important is that by copying what you see, you'll be able to reproduce it later when you want to draw from imagination. Also, take your time, don't rush.

As for metallic shines, there is a couple of things about metals. They are usually very dark, but, the highlights are really high. Notice how the collection of highlights is completely opposite on the fabric and metal of gangplank's glove. Also any objects around tend to be reflected, unless said metal is very rough or painted (which are all the metals in these pics, but the chains in the foreground are rougher than the rest)