/ic/ - Artwork/Critique

I've been on and off drawing regularly and whenever I actually sit down to actually draw, I lose my nerve or my lay-ins become messier than I want them to be.

Last time I posted something, I was advised to get accuracy down. Should I stick with still life or should I try to step up my game and practice doing portraits to improve faster?

Here's something I finished off Art Academy recently. Advice on what I should focus on or practice is greatly appreciated. (Took me about 3 hours which I feel is a little too long for a study like this)