Tried some perspective / architecture drawing since those are two of my biggest roadblocks in art.

What you see here is about half the sketch since my scanner is not bigger than A4.

After two hours this is what I came up with and I am pretty surprised  of the result, what started out as a terrible, inaccurate and generally bad line drawing with a ruler became this after some love and care.

I think with some more study and some help getting the base structures done with perspective I could become pretty good at this after a few weeks.