Presentation part1

Ladies and gentlemen, welcome to my presentation.
My name is Arn Walden
The topic of my presentation today is «digital art».
The reason that this topic is useful for you is How to bring a message in a creation»
We are going to talk about art.
These are, firstly, the context.
Secondly, the composition.
Finally we’re/I am going to speak/talk about colors and light
Due to the limited amount of time I have today, just seven minutes,
I’d appreciate it if you would keep your questions until the end. Thank you.

'These are' does not make sense because you have not said what 'these' are.

If this is oral, this is a fine presentation. If you are going to give it to somebody in written form. I would recommend 'do not' and 'I would' instead of 'don't' and 'I'd'.