Nice idea, a few little things about the spiders shadow you might like to think about. Firstly, where ever the spider's feet are touching the frame, the shadow should join the feet of the spider. Secondly these types of frames are not flat, so the spiders shadow needs to follow the contours of the frame, try using the warp tool to adjust the shadow. Good luck

Cool idea BUT: The spider has a white-edge residue around it (see hi-res; need to refine edge). All of the spider is 'out of bounds' which makes it look like it's just crawling on (not out of) the picture of a cobweb and thus this image is not on theme. The spider does not stand out even though it is supposed to be the focus per the title.

Adjusted the spider legs and shadows to touch along the frame.
Adjusted the edge masking
Some adjustments to drop shadow of the spider to be a bit more in the frame

very very nice i like it a lot

it is very nice one ,good luck

Much better

very nice work author...good luck

Very cool idea and work, do have a suggestion for consideration it is a very big frame and the top part is not really adding anything to the image so I would move it up a bit given more space between the frame and floor to add a molded skirting board just to finish the wall off and to give a more realistic feel.

Added a molding to the wall and adjusted the framing of the image -- thanks warlock for the suggestion

Glad it helped.....much improved good job!

Looks Good!