안녕하세요. 저는 그림 그리기를 좋아해요. 오늘, 저는 사람을 많이 그릴 것이에요. 그리고 저는 한국어를 공부할 것이에요. Both "그리기" and "그리는 것" mean "the act of drawing", though the latter also means "the thing one draws", but they are both OK. "그림 그리기" means "drawing pictures" and is by far the most commonly used, thus why I chose it. "그려" means "draw", which is inappropriate because it's a verb (you basically said "I like draw.") "-가 좋아요" and "-를 좋아해요" are both OK to use. Also, when you use "다" to end sentences, the appropriate pronoun is "나". When you use "요", you say "저". I hope this helps, and I apologize for going into excessive detail. Your sentences were perfectly easy to understand and the errors were minor.