Looks good, but it might be nice to put multiple designs on one piece of paper (and don't be afraid to let things overlap or interfere).
A couple of things I would like to mention:
- You can add contour lines to make it more easy to read the shape. You did this partly with your last watch design, but you can also do this for your BBQ designs.
- You play around with different line weights what is good, but use more than two thicknesses. For example your first BBQ has almost only thick lines, so there is no difference anymore.
- In some sketches it looks like your markers are almost empty, if this is the case refill them asap
Keep up the good work.