2/10 More effort next time. That is my honest review, it looks like you simply made some lines, used the paint bucket, and called it a day. If you are serious I have a few suggestions.
1. The outline should be a pixel wide, just use the line tool on whatever program you are using set to a single pixel.
2. Save as a .png for the love of God. jpegs are the shittiest format for images.
3. Use a scale, should vary depending on what you are making, eg. a pixel for every 0.5 metres for a ship or a pixel per milimetre for a rifle or pistole, or a pixel per centimetre for a tank or something. Whatever the scale is be consistent, taking some liberties for aesthetic reasons (eg. make the guns on your ship 1 or 2 pixels wide even if it would portray them as 500mm to 1 metre diameter guns so that someone looking at it can see where the guns are). Don't measure your hull in 1 centimeter per pixel and do your gun in 1.5 centimeters per pixel.
Edit: Also don''t trust Anemos, things don't get better, they slowly get worse until you give up and shoot yourself like I did.






