Impressive
I think this one here is "IMPRESSIVE" based on the original idea and concept you've "EXECUTED". I don't often see many men on-top of the cactus holding an umbrella from the sun, but the way you have the sun rays bouncing off the umbrella to showcase him hiding from the heat was a nice original idea I haven't really seen. The way he is sitting on the cactus is nice but makes me wonder if his ass is suffering hahaha, but it does work out well in terms of the concept you are doing here. I do think he is a bit too big for the proportion and size of the cactus, like he should be a bit smaller, unless this is like some kind of mega-cactus. I can see that working on this way in terms of proportions in "SIZE-AND-DEPTH". The sun rays seem to end suddenly in the art, so maybe extended them next time for a more consistent looking piece. I like his clothing colors and the "COLOR-OF-THE-UMBRELLA-TOO", as it seems to be like BEST BUY colors of an employee stranded hoping to be free of life hehe. I think that overall it is a nice little piece, almost like a comic from saturday morning newspaper comics, those one panel ones, maybe next time add some joke line or text above him with a line or witty saying.
~~THINGS TO IMPROVE ON~~
Add an adjustment to the size of the character or the size of the cactus as it seems off, the sun rays should be longer as those never generally end, and maybe some text lines with the man saying something comical.
~X~