"re-drawing" is a great way to learn! I say go ahead and post it but make sure to give credit to the original artist. Maybe even post their art along with yours and tag them.
Edit If you don't disclose that it's a re-draw, that's definitely art theft. You're concerned about what people will think if they know it's a re-draw? Who cares what they think! If you worked really hard on it and you are proud of it, go ahead and share. However, if you try to pass it off as an original piece and someone notices, you are gonna be in a crap load of trouble and people will not be nice about it. Just be honest from the start and people will think whatever they want to think.