All paintings are hard. Most artists say it is fun at first and then it gets more and more difficult and then you just want to finish it.
You are never completely happy with the work but it usually looks great after some time has passed and you forget what was bothering you about it or you know exactly what to do to complete it.
Well, sometimes it starts out great and just keeps going to the end! I have one of those right now and can hardly wait to put it online! I hope I can finish it today.