TimeSpaceLightForce

The artist in the market is giving this painting for free (the last one on his rack). I asked him if I can take it but he replied "Why should I give it to you?" The frame could be useful but I don't want to tell him that so I ask him why should he give it for free. He answered "because I miss to paint something into it". It looks like straight edge drawing to me but Im curious so I asked him what is missing in his painting. He told me that I can take it if I figured it out. I offer to buy it if he would tell me but he just refused while people are now gathering around the painting. What is missing?

so far just 2

nice but not the most that he can earn

Bill has five pennies . He shall make as many triangles as he can to gain more money. For every unique triangle that he creates on a flat table (3 corners at centers of coins) he wins a nickle but for some triangles that dont overlap or intersect with other triangles, he wins a dime. He shall declare the triangles he formed on the table. So Bill can name the identical coins A,B,C,D and E. Note U$ penny is 1-cent, nickle is 5-cents and dime is 10-cents. How shall Bill put all his coins on the table for greatest earnings?

that is cool .. a layout other than all vertical dominoes .

the above gif was copied from googled image .. i guess it is also a puzzle: where you place all 28 pieces of the double six set..vertical and horizontal dominoes are allowed.