The way of learning seems hard for those who learn it just for the sake of learning but once you really love what you're doing, learning becomes fun and with each day of learning, you discover how deep knowledge is. You can never be the master of something... you always get better at what you're doing. 
From making a simple illustration to making bridal illustrations I have come across many motivational people and artists. I can't mention all of them, but below are few who really motivated me and inspired me
1) @vik.kainth - A great artist himself, often comes live and answers all the design related question asked. He was the first one to inspire me. He just thinks out of the box and blows my mind every time.❤
2) @getzenteemental - Do check her page if you are reading this... She is just amazing and her art is love❤
3) @keshrt - I just love how he makes use of simple and basic elements and makes amazing artwork. His illustrations give me nostalgia and remind me of those comic books that we used to read during our childhood. ❤