It is very beautiful and interesting, i think you should buy the coloured sheets because you could make a lot of experiments with colouring. Maybe create a special series of drawing in this way:)

Dear @pipoune if you want to use nTopaz Platform you must upload your artwork here https://www.ntopaz.com, using it as a tag will not work. Check the platform, you log with steemconnect and then you can upload your artwork there. Your posts will appear at steemit also. Ntopaz is the biggest art community at Steem so your amazing drawings will get a lot of attention. Feel free to ask if you need help:)