I’d look at improving my gig descriptions if I were you. Lots of little mistakes that can be fixed. Use a tool like Grammarly.com to help you write better. It’s not always easy when English isn’t your native language, so Grammarly can be of great help!
Your illustrations look great!
I also see that your gigs use four tags, when you could have used five. Use the tags to your advantage. In your case I’d add “drawing” to the tag list for each gig.
Look into the Tips for sellers section here in the forums for more great tips!
I wrote this guide on how to rank your gig for search. Might be a good place to start.