Well first of all I think that lolicon being illegal is pretty stupid assuming that there is no harm done to anybody (which there have been, iirc there was a famous lolicon artist in Japan who was found to be tracing pictures of real child porn in his lolicon drawings). It's an incredibly touchy subject and I'd rather not lean too far one way or another but at the end of the day it's a fetish in the form of a drawing, I don't think there should be much of a problem.
Second of all you aren't going to go to jail for it even though it is technically illegal in Canada. If Canadian authorities spent all their time spying on what people were looking at in their homes they'd be arresting people for similar charges constantly - and as far as I can tell only two people have ever been arrested in Canada for lolicon art. Think about how much manpower and how much of a big operation it would be for governments to not just monitor all of the content you're looking at, but also act upon it. I've even heard before that the method of "monitoring" that authorities use is not as overbearing as we may think, or that the way in which internet sites are tracked is not as specific as we think, but that's for people smarter than me to explain (and very well could be wrong).
As for your final worry, I don't know, that's totally up to you. I'd like to think that separating the art from the artist is easy to do for myself personally, but considering you're implying enjoying his other art work, this could be especially hard ... since you're enjoying lewd artwork from someone that has made lewd artwork you find objectionable. All I'll say is that you'll have to think about this yourself and come to your own conclusion, because people aren't always going to be there to make conclusions for you when you find something objectionable in life.