can I ask you an advice how to draw and colouring a background? I'm struggling that my background didn't match the main character drawing (I'm sorry if my english is bad)
I’m not sure if I can give much advice since I myself don’t draw background much. Example;
There is this tutorial that I found before in FB but couldn’t find it anymore. But I guess this will help too http://kotaku.com/tips-for-drawing-backgrounds-1759168924 . Also other than looking at drawing background tips. I think you can look up for photography tips. They also help you in how to study about composition when drawing background.
The link above will help you as a reference on how to draw a good composition art.
Tips from me is, you need to understand your art elements first. What is the setting of your art. What is the mood. Is it happy? Sad? Intense? For example if your character is just standing with relaxed face you should add a calm atmosphere such as sky and cloud as background and not something intense.
In coloring- hm well I can’t help much with this since it depends on your coloring style (Mine is soft and vivid). But I always use a softer color for mine and try to contrast the character so they are not ‘drowned’ by the background.
I think you should know what do you want to draw first before randomly draw the background. Other than that, try to learn about perspective so your art doesn’t look awkward.
Your English is fine and hope this help. :)