Should i keep doing this?

I've made a little drawing for the 200 special, and gave away this drawing i made for Bea to 2 other people as a little special for reaching 200 .

I enjoy doing them but now the question

Should i do these more as little 'rewards' for example everyone who shares this amino, or when we hit another milestone, or as a prize for ing a contest? Here are some examples of what these would look like

I'm still working on perfecting the style so bare with the changes for now