Portfolio Critique/Advice for Vis Dev/BG Painting

Hello Concept Art community! I recently joined a few days ago with hopes to improve my portfolio. I graduated from college this last winter with a B.A. in math but I dream of becoming a vis dev artist. Though, lately I've gotten really interested in background painting.

I've been working to try to improve my fundamentals and design skills but sometimes I feel like I've hit a wall. This summer is my last chance to be eligible for internships, so I've been applying to places all over the US for jobs in visual design/dev and illustration. If possible, I would really appreciate critiques on my portfolio site. You can find it at http://lucialeeart.weebly.com/. Thank you in advance!